1 to 20 of  32 products for televue nagler telescope eyepieces

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55mm Tele Vue Plossl Telescope Eyepiece -6%

Since we introduced our Plossls in 1980, they have won praise and patents, including a patent in Japan. TeleVue Plossls, designed by Al Nagler, have been a recognized benchmark of performance and value in the class of 50 degree apparent field of vie

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Orion Telescopes & Binoculars
$255.00 $239.99 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN6-13

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$299.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN6-2.5, 2.5mm - 1.25 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$299.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN6-3.5, 3.5mm - 1.25 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$299.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN6-7, 7mm - 1.25 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$299.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN6-13, 13mm - 1.25 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

more >>
Hayneedle
$299.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN6-9, 9mm - 1.25 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$299.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN5-16, 16mm - 1.25 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$334.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN4-17, 17mm - 2 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$399.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN5-20, 20mm - 2 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$449.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN5-31, 31mm - 2 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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Hayneedle
$629.98 See It
TeleVue Nagler Zoom Telescope Eyepiece Multicolor - ENZ-0306

Shop for Eye Pieces from Hayneedle.com! TeleVue Nagler Zoom Eyepieces The TeleVue Nagler Zoom eyepieces are available in two options - a 2mm-4mm Zoom and a 3mm-6mm Zoom. Both are 1.25 Inch format. Both eyepieces features five elements in three groups and both have an apparent field of view of 50 degrees. Each has an eye relief of 10mm and both weight about 5.5 oz. The Nagler Zoom telescope eyepieces are best used as planetary eyepieces in shorter focal length refractor style telescopes. Most Schmidt-Cassegrain telescopse will not pair well with the Nagler Zoom eyepieces because of their long focal lengths. For example a 12" SCT with a 3000mm focal length (f/10 focal ratio) would have 500x to 1000x magnification in the 3mm-6mm option. This is simply far too much magnification for any practical use in the majority of sky conditions. Even in the most perfect of steady sky nights 500x magnification is just simply to much and 1000x would never be useful. The Nagler Zoom eyepieces are best used in shorter focal length telescopes. For example in a relatively standard 80mm aperture 480mm f/6 refractor telescope the 3mm-6mm Zoom would output 80x to 160x and would be a fantastic choice for lunar and planetary observations. It isn't every night that atmospheric conditions will allow high-power viewing but anyone can tell you that when those perfect evenings happen being able to get ultra-close is breathtaking. To study Saturn's ring structure up close or get every last detail of on the surface of Jupiter may only happen a handfull of evenings a year. For tweaking out the last bit of power that the atmosphere will permit the TeleVue Nagler Zoom eyepieces are the best tools you can have. Award Winning Eyepieces The TeleVue Nagler Zoom 2mm-4mm was awarded Sky & Telescope Hot Product of 2004 and the Nagler Zoom 3mm-6mm was awarded the same award in 2001. Parfocal at all focal lengths A great feature of the Nagler Zoom eyepieces is they are parfocal at each focal length. When changing from 3mm to 6mm the focas remains the same. Many other zoom eyepieces require changes in focus where the TeleVue Nager Zoom does not. (minor tweaking may be necessary)

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Hayneedle
$389.98 See It
TeleVue Nagler Telescope Eyepieces Multicolor - EN4-12, 12mm - 1.25 / 2 Inch Format

Shop for Eye Pieces from Hayneedle.com! Take a "spacewalk" across the widest sharpest apparent field... Concept: You may know there's a long history of naming eyepieces after their designers: Kellner Erfle and Plossl to name a few. In the late 70's I designed an eyepiece sufficiently radical that I dared attach my name to it. Even today I must admit a little discomfort when talking about "Nagler" eyepieces. With "Naglers" my aim is to approach the wide angle perspective of naked eye vision while maintaining the highest degree of sharpness contrast and viewing comfort. The goal is to allow the telescope to virtually "disappear " leaving the impact of "spacewalk" viewing. -Al Nagler Following are excerpts from the book The Backyard Astronomer by Dickenson & Dyer: "Al Nagler of Tele Vue caused a sensation when he introduced the Nagler in 1982. The Nagler's success can be attributed to two important innovations: an extremely wide apparent field of 82 degrees with outstanding sharpness and exceptionally comfortable eye relief for eyepieces of very short focal length...He designed his melding of eyepiece and Barlow to operate as a single unit; that is the aberrations of one cancel out the aberrations of the other producing exquisitely sharp images edge to edge over an unprecedentedly wide field of view. Nagler's background of optical-systems design for visual flight simulators and his interest in amateur astronomy created the perfect match for this breakthrough." Compare a penny to a half dollar to see the relative size between a 50 degree and 82 degree apparent field - almost 3 times the area difference! And while others boast of impressive apparent field sizes Tele Vue's philosophy of "showing no field unless it's fine" stresses full field image quality as the ingredient for impressive views. Blackened lens edges anti-reflection threads and rubber eyeguards deliver maximum contrast. Adapter skirts for 2" focusers on larger 1.25" models (12mm Nagler Type 4 and 22mm Panoptic) and rubber grip rings are additional Tele Vue "firsts". Even 2"/1 " barrel models have an additional feature allowing the 2" extension tube (EBX-2120) to be screwed on which permits use of 2" filters as well as 1 ". 100% full field visual inspection on our own flat-field test instruments guarantees the performance of every Tele Vue eyepiece. Nagler Type 4 Applying the experience of the Radian development to the 82 Nagler series yielded more contrast reduced pincushion more true field longer eye-relief and fewer elements to achieve focal lengths of 12mm 17mm and 22mm. With added eye-relief the click-stop Instadjust eyeguard helps maintain proper eye distance and centration. For deep sky viewing the comfort clarity and contrast gets us closer to our spacewalk viewing goal. Nagler Type 5 With the 31mm the unique 6-element design using four exotic glasses maintains the contrast advancement of the Type 4s while achieving a true field area 82% larger than the 22mm Type 4! Owners of fast

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TeleVue Nagler Zoom Telescope Eyepiece Multicolor - ENZ-0306, 3-6mm - 1.25 Inch Format

Shop for Eye Pieces from Hayneedle.com! TeleVue Nagler Zoom Eyepieces The TeleVue Nagler Zoom eyepieces are available in two options - a 2mm-4mm Zoom and a 3mm-6mm Zoom. Both are 1.25 Inch format. Both eyepieces features five elements in three groups and both have an apparent field of view of 50 degrees. Each has an eye relief of 10mm and both weight about 5.5 oz. The Nagler Zoom telescope eyepieces are best used as planetary eyepieces in shorter focal length refractor style telescopes. Most Schmidt-Cassegrain telescopse will not pair well with the Nagler Zoom eyepieces because of their long focal lengths. For example a 12" SCT with a 3000mm focal length (f/10 focal ratio) would have 500x to 1000x magnification in the 3mm-6mm option. This is simply far too much magnification for any practical use in the majority of sky conditions. Even in the most perfect of steady sky nights 500x magnification is just simply to much and 1000x would never be useful. The Nagler Zoom eyepieces are best used in shorter focal length telescopes. For example in a relatively standard 80mm aperture 480mm f/6 refractor telescope the 3mm-6mm Zoom would output 80x to 160x and would be a fantastic choice for lunar and planetary observations. It isn't every night that atmospheric conditions will allow high-power viewing but anyone can tell you that when those perfect evenings happen being able to get ultra-close is breathtaking. To study Saturn's ring structure up close or get every last detail of on the surface of Jupiter may only happen a handfull of evenings a year. For tweaking out the last bit of power that the atmosphere will permit the TeleVue Nagler Zoom eyepieces are the best tools you can have. Award Winning Eyepieces The TeleVue Nagler Zoom 2mm-4mm was awarded Sky & Telescope Hot Product of 2004 and the Nagler Zoom 3mm-6mm was awarded the same award in 2001. Parfocal at all focal lengths A great feature of the Nagler Zoom eyepieces is they are parfocal at each focal length. When changing from 3mm to 6mm the focas remains the same. Many other zoom eyepieces require changes in focus where the TeleVue Nager Zoom does not. (minor tweaking may be necessary)

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TeleVue Telescopes Plossl Eyepieces Multicolor - EPL-32

Shop for Eye Pieces from Hayneedle.com! Since we introduced our Plossls in 1980 they have won praise and patents including a patent in Japan. Tele Vue Plossls designed by Al Nagler have been a recognized benchmark of performance and value in the class of 50-degree apparent field-of-view eyepieces. While the Plossls may be our least expensive eyepiece line they still enjoy the same care and attention to detail as our most expensive. While it's easy for other manufacturers to vie for the lowest price Tele Vue continues to believe that quality performance and consistency will ultimately reward you with the most value for your dollar. Diffraction limited "on-axis" performance is a given. Using more expensive high-index glasses to reduce astigmatism and lateral color at the field's edge Tele Vue Plossls deliver sharper images than any other brand of 4 or 5 element "Plossl" or Orthoscopic designs. The faster the focal ratio of your telescope the greater your visual reward for using Tele Vue eyepieces. Tele Vue Plossls feature full multi-coatings for greatest light transmission and contrast. Blackened lens edges and internal anti-reflection threads tweak the last bit of contrast for maximum image detail. The sharper field focuses faint star light into perceptible points and allows those with undriven mounts to gaze longer before repositioning the image. The 55mm focal length has the largest true field possible for 2" eyepiece holders -3 times the true field area of any 1-1/4" eyepiece. The focal plane is placed at the end of the barrel to minimize vignetting. Performance with Schmidt-Cassegrains is remarkable since it avoids the image degradation and severe vignetting which occurs when using telecompressors. Long eye-relief and unique adjustable eyeguard for eyeglass wearers. In the 1-1/4" series we included a long eye-relief 40mm focal length in the series with a 43 degree apparent field. Like the 55mm its focal plane is at the barrel edge for maximum field in the 1-1/4" format. The 32mm Plossl with its larger 50 degree apparent field will deliver the same true field as the 40mm but with higher magnification. The 32mm is parfocal with the shorter focal length Plossls. The 25mm 20mm 15mm 11mm and 8mm Plossls round out the focal lengths for various observing from deep sky to planetary. They work best with Tele Vue Powermates to effectively double the number of focal lengths in your collection. Far superior to eyepieces usually provided as standard with most instruments. For a bit more than generic brands you can own a genuine Tele Vue Plossl.

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TeleVue ETHOS Telescope Eyepieces Multicolor - ETH-08.0

Shop for Eye Pieces from Hayneedle.com! Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepiece brings new meaning to the term in-house. The concept for this eyepiece was first proposed by Tele Vue President David Nagler with performance parameters giving it the fundamental characteristics (the ethos) of a Tele Vue eyepiece: high contrast comfortable eye relief and full field sharpness. Control of astigmatism field curvature lateral color angular magnification distortion correction and low pupil sensitivity for daytime use were specified criteria. Following Tele Vue s philosophy of pushing the state of the art long-time Tele Vue employee and optical design protege Paul Dellechiaie took up the challenge and designed the basic eyepiece form. Under Al s guidance Paul tweaked his design to fulfill the original goals. While sharpness is inherent to the optical design contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance high efficiency coatings tuned to the composition of each element. At the 2007 Northeast Astronomy Forum Tele Vue once again broadened the amateur astronomer's perspective on the universe and introduced a new observing experience; 100 of pure Tele Vue quality. With a 13mm focal length evoking the original Nagler revolution the field area of this new eyepiece is more than 50% larger than an 82 field. The Tele Vue Ethos is essentially multiple eyepieces delivering the true field size of a longer focal length narrower apparent field eyepiece with the benefits of higher power and darker sky background. The 21mm focal length completes the logical set of 21mm/13mm/8mm and nicely juxtaposes the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm's effective field stop diameter is 36.2mm bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). Its true field is also larger than the 26mm Nagler with its 35mm effective field stop diameter. In an f/4 Dobsonian the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic or 6.5mm with a 26mm Nagler. The 17mm ETHOS is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area. We have not specifically endorsed the 13mm Ethos for Bino-Vue use because of the large diameter barrel. Even so we were advised by Mike Harvey at the Winter Star Party (February 2008) that only 1-person in 25 had interpupilary limits with the bino'd Ethos (63.5-mm for the initial production 13mm). However since many of our customers have been thrilled with the experience we have maximized the potential use by narrowing the barrel from 63.5-mm to 62-mm diameter for eyepieces delivered beginning mid-March 2008. While the difference is only 1.5-mm (or 0.75-mm for pairing a first production unit with current productio

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Hayneedle
$559.98 See It
TeleVue ETHOS Telescope Eyepieces Multicolor - ETH-08.0, 8mm

Shop for Eye Pieces from Hayneedle.com! Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepiece brings new meaning to the term in-house. The concept for this eyepiece was first proposed by Tele Vue President David Nagler with performance parameters giving it the fundamental characteristics (the ethos) of a Tele Vue eyepiece: high contrast comfortable eye relief and full field sharpness. Control of astigmatism field curvature lateral color angular magnification distortion correction and low pupil sensitivity for daytime use were specified criteria. Following Tele Vue s philosophy of pushing the state of the art long-time Tele Vue employee and optical design protege Paul Dellechiaie took up the challenge and designed the basic eyepiece form. Under Al s guidance Paul tweaked his design to fulfill the original goals. While sharpness is inherent to the optical design contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance high efficiency coatings tuned to the composition of each element. At the 2007 Northeast Astronomy Forum Tele Vue once again broadened the amateur astronomer's perspective on the universe and introduced a new observing experience; 100 of pure Tele Vue quality. With a 13mm focal length evoking the original Nagler revolution the field area of this new eyepiece is more than 50% larger than an 82 field. The Tele Vue Ethos is essentially multiple eyepieces delivering the true field size of a longer focal length narrower apparent field eyepiece with the benefits of higher power and darker sky background. The 21mm focal length completes the logical set of 21mm/13mm/8mm and nicely juxtaposes the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm's effective field stop diameter is 36.2mm bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). Its true field is also larger than the 26mm Nagler with its 35mm effective field stop diameter. In an f/4 Dobsonian the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic or 6.5mm with a 26mm Nagler. The 17mm ETHOS is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area. We have not specifically endorsed the 13mm Ethos for Bino-Vue use because of the large diameter barrel. Even so we were advised by Mike Harvey at the Winter Star Party (February 2008) that only 1-person in 25 had interpupilary limits with the bino'd Ethos (63.5-mm for the initial production 13mm). However since many of our customers have been thrilled with the experience we have maximized the potential use by narrowing the barrel from 63.5-mm to 62-mm diameter for eyepieces delivered beginning mid-March 2008. While the difference is only 1.5-mm (or 0.75-mm for pairing a first production unit with current productio

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Hayneedle
$559.98 See It
TeleVue ETHOS Telescope Eyepieces Multicolor - ETH-06.0, 6mm

Shop for Eye Pieces from Hayneedle.com! Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepiece brings new meaning to the term in-house. The concept for this eyepiece was first proposed by Tele Vue President David Nagler with performance parameters giving it the fundamental characteristics (the ethos) of a Tele Vue eyepiece: high contrast comfortable eye relief and full field sharpness. Control of astigmatism field curvature lateral color angular magnification distortion correction and low pupil sensitivity for daytime use were specified criteria. Following Tele Vue s philosophy of pushing the state of the art long-time Tele Vue employee and optical design protege Paul Dellechiaie took up the challenge and designed the basic eyepiece form. Under Al s guidance Paul tweaked his design to fulfill the original goals. While sharpness is inherent to the optical design contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance high efficiency coatings tuned to the composition of each element. At the 2007 Northeast Astronomy Forum Tele Vue once again broadened the amateur astronomer's perspective on the universe and introduced a new observing experience; 100 of pure Tele Vue quality. With a 13mm focal length evoking the original Nagler revolution the field area of this new eyepiece is more than 50% larger than an 82 field. The Tele Vue Ethos is essentially multiple eyepieces delivering the true field size of a longer focal length narrower apparent field eyepiece with the benefits of higher power and darker sky background. The 21mm focal length completes the logical set of 21mm/13mm/8mm and nicely juxtaposes the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm's effective field stop diameter is 36.2mm bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). Its true field is also larger than the 26mm Nagler with its 35mm effective field stop diameter. In an f/4 Dobsonian the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic or 6.5mm with a 26mm Nagler. The 17mm ETHOS is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area. We have not specifically endorsed the 13mm Ethos for Bino-Vue use because of the large diameter barrel. Even so we were advised by Mike Harvey at the Winter Star Party (February 2008) that only 1-person in 25 had interpupilary limits with the bino'd Ethos (63.5-mm for the initial production 13mm). However since many of our customers have been thrilled with the experience we have maximized the potential use by narrowing the barrel from 63.5-mm to 62-mm diameter for eyepieces delivered beginning mid-March 2008. While the difference is only 1.5-mm (or 0.75-mm for pairing a first production unit with current productio

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Hayneedle
$559.98 See It
TeleVue ETHOS Telescope Eyepieces Multicolor - ETH-10.0, 10mm

Shop for Eye Pieces from Hayneedle.com! Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepiece brings new meaning to the term in-house. The concept for this eyepiece was first proposed by Tele Vue President David Nagler with performance parameters giving it the fundamental characteristics (the ethos) of a Tele Vue eyepiece: high contrast comfortable eye relief and full field sharpness. Control of astigmatism field curvature lateral color angular magnification distortion correction and low pupil sensitivity for daytime use were specified criteria. Following Tele Vue s philosophy of pushing the state of the art long-time Tele Vue employee and optical design protege Paul Dellechiaie took up the challenge and designed the basic eyepiece form. Under Al s guidance Paul tweaked his design to fulfill the original goals. While sharpness is inherent to the optical design contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance high efficiency coatings tuned to the composition of each element. At the 2007 Northeast Astronomy Forum Tele Vue once again broadened the amateur astronomer's perspective on the universe and introduced a new observing experience; 100 of pure Tele Vue quality. With a 13mm focal length evoking the original Nagler revolution the field area of this new eyepiece is more than 50% larger than an 82 field. The Tele Vue Ethos is essentially multiple eyepieces delivering the true field size of a longer focal length narrower apparent field eyepiece with the benefits of higher power and darker sky background. The 21mm focal length completes the logical set of 21mm/13mm/8mm and nicely juxtaposes the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm's effective field stop diameter is 36.2mm bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). Its true field is also larger than the 26mm Nagler with its 35mm effective field stop diameter. In an f/4 Dobsonian the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic or 6.5mm with a 26mm Nagler. The 17mm ETHOS is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area. We have not specifically endorsed the 13mm Ethos for Bino-Vue use because of the large diameter barrel. Even so we were advised by Mike Harvey at the Winter Star Party (February 2008) that only 1-person in 25 had interpupilary limits with the bino'd Ethos (63.5-mm for the initial production 13mm). However since many of our customers have been thrilled with the experience we have maximized the potential use by narrowing the barrel from 63.5-mm to 62-mm diameter for eyepieces delivered beginning mid-March 2008. While the difference is only 1.5-mm (or 0.75-mm for pairing a first production unit with current productio

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Hayneedle
$589.98 See It
TeleVue ETHOS Telescope Eyepieces Multicolor - ETH-17.0, 17mm

Shop for Eye Pieces from Hayneedle.com! Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepiece brings new meaning to the term in-house. The concept for this eyepiece was first proposed by Tele Vue President David Nagler with performance parameters giving it the fundamental characteristics (the ethos) of a Tele Vue eyepiece: high contrast comfortable eye relief and full field sharpness. Control of astigmatism field curvature lateral color angular magnification distortion correction and low pupil sensitivity for daytime use were specified criteria. Following Tele Vue s philosophy of pushing the state of the art long-time Tele Vue employee and optical design protege Paul Dellechiaie took up the challenge and designed the basic eyepiece form. Under Al s guidance Paul tweaked his design to fulfill the original goals. While sharpness is inherent to the optical design contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance high efficiency coatings tuned to the composition of each element. At the 2007 Northeast Astronomy Forum Tele Vue once again broadened the amateur astronomer's perspective on the universe and introduced a new observing experience; 100 of pure Tele Vue quality. With a 13mm focal length evoking the original Nagler revolution the field area of this new eyepiece is more than 50% larger than an 82 field. The Tele Vue Ethos is essentially multiple eyepieces delivering the true field size of a longer focal length narrower apparent field eyepiece with the benefits of higher power and darker sky background. The 21mm focal length completes the logical set of 21mm/13mm/8mm and nicely juxtaposes the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm's effective field stop diameter is 36.2mm bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). Its true field is also larger than the 26mm Nagler with its 35mm effective field stop diameter. In an f/4 Dobsonian the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic or 6.5mm with a 26mm Nagler. The 17mm ETHOS is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area. We have not specifically endorsed the 13mm Ethos for Bino-Vue use because of the large diameter barrel. Even so we were advised by Mike Harvey at the Winter Star Party (February 2008) that only 1-person in 25 had interpupilary limits with the bino'd Ethos (63.5-mm for the initial production 13mm). However since many of our customers have been thrilled with the experience we have maximized the potential use by narrowing the barrel from 63.5-mm to 62-mm diameter for eyepieces delivered beginning mid-March 2008. While the difference is only 1.5-mm (or 0.75-mm for pairing a first production unit with current productio

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$699.98 See It
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