Tele Vue's Delos 3.5mm is a short focal length eyepiece that will deliver high power magnification. Importantly though it still achieves a generous 20mm eye-relief and wide 72° apparent field of view. Amazing in well corrected refractors with short to medium focal lengths. High powered views without the need for a Barlows or Powermate!

There is a good chance the TeleVue Delos will be seen as the ultimate combination of performance, viewing comfort and price. If you've been keeping a spot in your case for an affordable, premium eyepiece, you should consider a Delos - you won't be disappointed! Lessons learned from the tremendously successful Ethos series were applied to develop this long eye-relief, 72° apparent field of view eyepiece line.

All focal lengths feature 1.25" barrels making them suitable for almost any telescope or even bino-viewers!

Tele Vue Delos 3.5mm - Specifications

• Model # EDL-03.5
• Focal Length 3.5mm
• Barrel Size 1.25"
• Apparent Field of View 72°
• Eye Relief 20mm
• Weight 499g
• Field Stop 4.4mm

Background:

In 2011 Tele Vue introduced the Delos, mid-to-short focal length line of 20mm eye-relief, 72° apparent field of view eyepieces. Every optical, mechanical, and ergonomic aspect was rethought to achieve reference-standard performance for any visual application.

The Delos was conceived as a narrower field Ethos. Reducing the field to 72° allowed freedom to increase eye-relief, while controlling pupil aberrations, all without making the eyepiece too large. With Ethos performance standards as benchmarks, the Delos design achieves full field sharpness, virtually perfect f θ (theta) distortion mapping, and color neutrality. Image fidelity is maximized utilizing glass matched multicoatings and anti-reflection surfaces throughout the eyepiece.

Contrast is further enhanced with a new, continuously adjustable height eyeguard system that can be locked in any position. Since the Delos eye-lens measures a quite large 35mm in diameter, preventing stray light from reflecting off the first surface and extraneous light from entering your eye pays off in a nice increase in perceived contrast. The eyeguard's sliding action allows for positioning the soft rubber eyeguard at the ideal height to suit the observer's preference. Indicator marks on the eyepiece body are handy reference guides for setting your perfect position. The eye-guard can also rotate for Dioptrx users.

Awards - Delos 6mm and 10mm

Reviews

Sky & Telescope Hot New Product for 2012 Award

Review of the 6mm & 10mm Delos from Astronomy Magazine, December 2011

Excerpts from Sky & Telescope, June 2011, review of Delos eyepieces:

WHAT WE LIKE:

Essentially perfect optics
"Immersive" observation experience

WHAT WE DON'T LIKE:

I spent several nights viewing the Moon, Saturn, stars and nebulae with a variety of telescopes … .

The Delos eyepieces are "easy to look through … . They have flat fields, delivering absolute pinpoint stars from edge to edge with no hint of color aberration. The view, especially during the daytime, is very pure with no noticeable color tint. And there wasn't a hint of ghosts or reflections, even with the brightest stars".

"What caught me a bit off guard, however, was something that's best described as the observing experience. It was distinctly pleasurable."

"I have the sensation of looking out of a circular window rather than into an eyepiece."

— di Cicco, Dennis. "Tele Vue's New Delos Eyepieces". Sky & Telescope (June 2011). p. 58, 59.

Tele Vue's Delos 4.5mm is a short focal length eyepiece that will deliver high power magnification. Importantly though it still achieves a generous 20mm eye-relief and wide 72° apparent field of view. Amazing in well corrected refractors with short to medium focal lengths. High powered views without the need for a Barlows or Powermate!

There is a good chance the TeleVue Delos will be seen as the ultimate combination of performance, viewing comfort and price. If you've been keeping a spot in your case for an affordable, premium eyepiece, you should consider a Delos - you won't be disappointed! Lessons learned from the tremendously successful Ethos series were applied to develop this long eye-relief, 72° apparent field of view eyepiece line.

The Delos 4.5mm has a standard 1.25" barrel making it suitable for almost any telescope or even bino-viewers!

Tele Vue Delos 4.5mm - Specifications

• Model # EDL-04.5
• Focal Length 4.5mm
• Barrel Size 1.25"
• Apparent Field of View 72°
• Eye Relief 20mm
• Weight 499g
• Field Stop 5.6mm

Background:

In 2011 Tele Vue introduced the Delos, mid-to-short focal length line of 20mm eye-relief, 72° apparent field of view eyepieces. Every optical, mechanical, and ergonomic aspect was rethought to achieve reference-standard performance for any visual application.

The Delos was conceived as a narrower field Ethos. Reducing the field to 72° allowed freedom to increase eye-relief, while controlling pupil aberrations, all without making the eyepiece too large. With Ethos performance standards as benchmarks, the Delos design achieves full field sharpness, virtually perfect f θ (theta) distortion mapping, and color neutrality. Image fidelity is maximized utilizing glass matched multicoatings and anti-reflection surfaces throughout the eyepiece.

Contrast is further enhanced with a new, continuously adjustable height eyeguard system that can be locked in any position. Since the Delos eye-lens measures a quite large 35mm in diameter, preventing stray light from reflecting off the first surface and extraneous light from entering your eye pays off in a nice increase in perceived contrast. The eyeguard's sliding action allows for positioning the soft rubber eyeguard at the ideal height to suit the observer's preference. Indicator marks on the eyepiece body are handy reference guides for setting your perfect position. The eye-guard can also rotate for Dioptrx users.

Awards - Delos 6mm and 10mm

Reviews

Sky & Telescope Hot New Product for 2012 Award

Review of the 6mm & 10mm Delos from Astronomy Magazine, December 2011

Excerpts from Sky & Telescope, June 2011, review of Delos eyepieces:

WHAT WE LIKE:

Essentially perfect optics
"Immersive" observation experience

WHAT WE DON'T LIKE:

I spent several nights viewing the Moon, Saturn, stars, and nebulae with a variety of telescopes

The Delos eyepieces are "easy to look through … . They have flat fields, delivering absolute pinpoint stars from edge to edge with no hint of color aberration. The view, especially during the daytime, is very pure with no noticeable color tint. And there wasn't a hint of ghosts or reflections, even with the brightest stars".

"What caught me a bit off guard, however, was something that's best described as the observing experience. It was distinctly pleasurable."

"I have the sensation of looking out of a circular window rather than into an eyepiece."

— di Cicco, Dennis. "Tele Vue's New Delos Eyepieces". Sky & Telescope (June 2011). p. 58, 59.

Tele Vue's Delos 6mm is a short focal length eyepiece that will deliver high power magnification. Importantly though it still achieves a generous 20mm eye-relief and wide 72° apparent field of view. Amazing in well corrected refractors with short to medium focal lengths. High powered views without the need for a Barlows or Powermate! The Delos 6mm provides 333x magnification in an 8" f/10 Schmidt Cassegrain making it an amazing eyepiece for high powered views (without going too far)!

There is a good chance the TeleVue Delos will be seen as the ultimate combination of performance, viewing comfort and price. If you've been keeping a spot in your case for an affordable, premium eyepiece, you should consider a Delos - you won't be disappointed! Lessons learned from the tremendously successful Ethos series were applied to develop this long eye-relief, 72° apparent field of view eyepiece line.

The Delos 6mm has a 1.25" barrel making it suitable for almost any telescope or even bino-viewers!

Tele Vue Delos 6mm - Specifications

• Model # EDL-06.0
• Focal Length 6mm
• Barrel Size 1.25"
• Apparent Field of View 72°
• Eye Relief 20mm
• Weight 453g
• Field Stop 7.6mm

Background:

In 2011 Tele Vue introduced the Delos, mid-to-short focal length line of 20mm eye-relief, 72° apparent field of view eyepieces. Every optical, mechanical, and ergonomic aspect was rethought to achieve reference-standard performance for any visual application.

The Delos was conceived as a narrower field Ethos. Reducing the field to 72° allowed freedom to increase eye-relief, while controlling pupil aberrations, all without making the eyepiece too large. With Ethos performance standards as benchmarks, the Delos design achieves full field sharpness, virtually perfect f θ (theta) distortion mapping, and color neutrality. Image fidelity is maximized utilizing glass matched multicoatings and anti-reflection surfaces throughout the eyepiece.

Contrast is further enhanced with a new, continuously adjustable height eyeguard system that can be locked in any position. Since the Delos eye-lens measures a quite large 35mm in diameter, preventing stray light from reflecting off the first surface and extraneous light from entering your eye pays off in a nice increase in perceived contrast. The eyeguard's sliding action allows for positioning the soft rubber eyeguard at the ideal height to suit the observer's preference. Indicator marks on the eyepiece body are handy reference guides for setting your perfect position. The eye-guard can also rotate for Dioptrx users.

Reviews

Sky & Telescope Hot New Product for 2012 Award

Review of the 6mm & 10mm Delos from Astronomy Magazine, December 2011

Excerpts from Sky & Telescope, June 2011, review of Delos eyepieces:

WHAT WE LIKE:

Essentially perfect optics
"Immersive" observation experience

WHAT WE DON'T LIKE:

I spent several nights viewing the Moon, Saturn, stars and nebulae with a variety of telescopes … .

The Delos eyepieces are "easy to look through … . They have flat fields, delivering absolute pinpoint stars from edge to edge with no hint of color aberration. The view, especially during the daytime, is very pure with no noticeable color tint. And there wasn't a hint of ghosts or reflections, even with the brightest stars".

"What caught me a bit off guard, however, was something that's best described as the observing experience. It was distinctly pleasurable."

"I have the sensation of looking out of a circular window rather than into an eyepiece."

— di Cicco, Dennis. "Tele Vue's New Delos Eyepieces". Sky & Telescope (June 2011). p. 58, 59.

Tele Vue's Delos 8mm is a short to mid focal length eyepiece that will deliver useful magnification in almost any telescope. With a generous 20mm eye-relief and wide 72° apparent field of view the views will astound. Wide fields of view in telescopes with short to medium focal lengths (almost 1° in 600mm focal length telescopes). Mid to high powered views without the need for a Barlows or Powermate in Cassegrain telescopes! The Delos 8mm would be a worth investment for just about any telescope

There is a good chance the TeleVue Delos will be seen as the ultimate combination of performance, viewing comfort and price. If you've been keeping a spot in your case for an affordable, premium eyepiece, you should consider a Delos - you won't be disappointed! Lessons learned from the tremendously successful Ethos series were applied to develop this long eye-relief, 72° apparent field of view eyepiece line.

The Delos 8mm has a standard 1.25" barrel making it suitable for almost any telescope or even bino-viewers!

Tele Vue Delos 8mm - Specifications

• Model # EDL-08.8
• Focal Length 8mm
• Barrel Size 1.25"
• Apparent Field of View 72°
• Eye Relief 20mm
• Weight 454g
• Field Stop 9.9mm

Background:

In 2011 Tele Vue introduced the Delos, mid-to-short focal length line of 20mm eye-relief, 72° apparent field of view eyepieces. Every optical, mechanical, and ergonomic aspect was rethought to achieve reference-standard performance for any visual application.

The Delos was conceived as a narrower field Ethos. Reducing the field to 72° allowed freedom to increase eye-relief, while controlling pupil aberrations, all without making the eyepiece too large. With Ethos performance standards as benchmarks, the Delos design achieves full field sharpness, virtually perfect f θ (theta) distortion mapping, and color neutrality. Image fidelity is maximized utilizing glass matched multicoatings and anti-reflection surfaces throughout the eyepiece.

Contrast is further enhanced with a new, continuously adjustable height eyeguard system that can be locked in any position. Since the Delos eye-lens measures a quite large 35mm in diameter, preventing stray light from reflecting off the first surface and extraneous light from entering your eye pays off in a nice increase in perceived contrast. The eyeguard's sliding action allows for positioning the soft rubber eyeguard at the ideal height to suit the observer's preference. Indicator marks on the eyepiece body are handy reference guides for setting your perfect position. The eye-guard can also rotate for Dioptrx users.

Awards - Delos 6mm and 10mm

Reviews

Sky & Telescope Hot New Product for 2012 Award

Review of the 6mm & 10mm Delos from Astronomy Magazine, December 2011

Excerpts from Sky & Telescope, June 2011, review of Delos eyepieces:

WHAT WE LIKE:

Essentially perfect optics
"Immersive" observation experience

WHAT WE DON'T LIKE:

I spent several nights viewing the Moon, Saturn, stars and nebulae with a variety of telescopes … .

The Delos eyepieces are "easy to look through … . They have flat fields, delivering absolute pinpoint stars from edge to edge with no hint of color aberration. The view, especially during the daytime, is very pure with no noticeable color tint. And there wasn't a hint of ghosts or reflections, even with the brightest stars".

"What caught me a bit off guard, however, was something that's best described as the observing experience. It was distinctly pleasurable."

"I have the sensation of looking out of a circular window rather than into an eyepiece."

— di Cicco, Dennis. "Tele Vue's New Delos Eyepieces". Sky & Telescope (June 2011). p. 58, 59.

Tele Vue Dovetail Base for Televue Quick Release Finder Scope Bracket

Quick Release Tele Vue Dovetail . This machined metal, pre-drilled dovetail base attaches directly to the Tele Vue Universal Finder Mount so it can be converted to a quick-release mount. For solar observers who want a quick conversion, the Sol Searcher finderscope can also be made into a quick-release accessory when mounted on  QRB-1002 (Quick-release bracket). Manufactured by Tele Vue for top quality!

Tele Vue Equalizer 2 Inch - 1.25 Inch Adapter

Equalizer model

A heavy solid bronze version called the "Equalizer" adds 12-ounces to help equalize the weight when switching from heavy 2" eyepieces to light 1¼" eyepieces. Features exclusive anti-reflection angle that prevents reflection back to the objective.

Tele Vue Ethos 10mm Specifications

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. 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.

We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.

Related Links

•Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.

•Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.

Tele Vue Ethos 13mm Specifications

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. 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.

We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.

Backordered currently 3-4 Weeks

Related Links

•Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.

•Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. The field area of this new eyepiece is more than 50% larger than an 82° field. The Tele Vue Ethos 17mm 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.

We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.

The Tele Vue ETHOS 17mm is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 10mm above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area.

Tele Vue Ethos 17mm Specifications

Related Links

•Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.

•Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.

Tele Vue Ethos 21mm Specifications

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. 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.

Tele Vue Ethos 6mm Specifications

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. 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.

We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.

•Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.

•Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.

Tele Vue Ethos 8mm

The Tele Vue Ethos 8mm was first demonstrated at NEAF in 2008. In addition to matching all the key performance criteria of its 13mm sibling, the new 8mm version is parfocal in 1¼" focusers with Radians, Plössls, Type 6 Naglers and 1¼" Panoptics.

Its lighter weight and smaller diameter than the 13mm Ethos makes the 8mm suitable for anyone using a binocular viewer. A perfect eyepiece for terrestrial viewing with a short refractor. Comparing an 8mm Ethos to an 8–24mm Zoom eyepiece, the 8mm Ethos has the power of the 8mm Zoom and 83% of the field of the 24mm setting!

Tele Vue is still the leader in high performance, wide angle eyepieces for astronomy. There will always be cheap imitators, but astronomers the world over agree Tele Vue eyepieces are simply the best. One look is all it takes...come and see for yourself!

Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; the development of the Ethos series brought new meaning to the term "in-house." The concept for this eyepiece series was 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 colour, 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 protégé 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.

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. 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.

Tele Vue Ethos 8mm Specifications

Related Links

Instruction Sheet

Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.

Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.

Tele Vue Ethos SX 3.7mm Specifications

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. 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.

We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.

Related Links

•Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.

•Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.

Tele Vue Ethos SX 4.7mm Specifications

Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. 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.

We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.

Related Links

•Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.

•Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.

Tele Vue Extension Tube 3.5 Inch

Telescope drawtube extensions help your telescope reach focus when not using a diagonal — as is the case in many imaging applications. They are also useful (with or without diagonal) when you need more out-travel for focusing on nearby terrestrial subjects.

Our extentions tubes slip into any telescope's 2" drawtube and include brass clamp rings to prevent marring of accessory barrels

Tele Vue Eyeguard Extender, Twist-on Style

Eyeguard Extender raises the eyeguard position by 8mm, and includes a rubber eyeguard and eyepiece cap (in case yours is lost or damaged.) Units are stackable: for example 2 units add 16mm height and make a 40mm Plössl very comfortable for solar viewing by blocking out stray daylight to maximize contrast in white light or hydrogen-alpha viewing.

Eyeguard extender is black anodized aluminum with anti-reflection threads.

The Eyeguard Extender attaches to the top of your eyepiece with the simplicity of a DIOPTRX™ corrector. It has two rings that thread together to clamp on the eyepiece: an inner-ring that holds the rubber eyeguard and outer ring that slips over the top of the eyepiece. Starting with the inner-ring backed off from fully tight, take off your existing rubber eyeguard, place the Eyeguard Extender in its place, screw-down the inner ring until the Eyeguard does not slip off.

This adjustable-speed, electric motor-drive installs easily onto the Focusmate unit, and offers a unique quick disconnect for switching (without tools) between electric and manual operation. Variable-speed, forward/reverse, battery-operated hand-controller is included.

With the exception of the TV-60 (non-"is" version), all current production Tele Vue scopes accept a digital Indicator Kit -- so that their fullest imaging and visual performance can be realized. If a digital Indicator Kit, is installed, measurement is possible to an unprecedented 0.0001" (1/10,000"). A gentle tap on the motor direction switch can produce steps as small as about 0.0005" (5/10,000"). Truly, focusing will be "even better than you imagined."

Models available for 10:1 Focusmates (all black) and left or right-side mounted 6:1 Focusmates (chrome shafts).

• Vibration-free motor-drive unit
• Two-button hand-controller with variable-speed knob
• Motor-ring mount, with quick disconnect and focuser mounting instructions

Tele Vue Imaging System Adapter - 2 Inch to 2.4 Inch

2.4" Adapter for 2" Accessories is another key component that expands the usability of your existing 2" accessories. The adapter allows any 2” accessory to connect to the Imaging System. This includes cameras and filter wheels with 2" nosepieces. This adapter includes dual thumb-screws and non-marring brass clamp ring.

The 2.4 inch imaging system connection is found on the Tele Vue NP-101is and Tele Vue NP-127is APO refractors.

This 2" to 1¼" adapter allows more in-travel for 1¼" eyepieces than our "flat-top" or "high-hat" adapters. This adapter is designed to attach to the 1¼" eyepiece barrel and convert the eyepiece for use with a 2" focuser or diagonal. The main application is for 1¼" eyepieces that may need more in-travel due to limited focuser range of your telescope.

The "In-Travel" model achieves the following amount of in-travel benefit compared to our conventional 2" to 1¼" adapters.

Our ring sets provide rigid mounting for astro-imaging with our 4" and 5" scopes. Bottom and top of each ring is drilled for ¼"-20 hardware, have bat-handle locks, and two Tele Vue accessory slots for ring-mounted accessories such as Starbeam with Tele Vue base, Sol-Searcher, Piggy-Cam and others.

Sets come with a top accessory bar, bottom mounting plate to allow spacing them 5.5" to 6.5" apart. The included bottom plate (BPL-1098) is drilled to mate to a variety of mounts or mounting adapter plates - including the Tele Vue/Vixen Mount Adapter (AVT-1011) and Tele Vue Gibraltar-5 Head.

For NP101/NP101is with outside tube diameter of exactly 4-inches.

Tele Vue Mounting Ring Set 5 Inch

Our ring sets provide rigid mounting for astro-imaging with our 4" and 5" scopes. Bottom and top of each ring is drilled for ¼”-20 hardware, have bat-handle locks, and two Tele Vue accessory slots for ring-mounted accessories such as Starbeam with Tele Vue base, Sol-Searcher, Piggy-Cam and others.

Sets come with a top accessory bar, bottom mounting plate to allow spacing them 5.5″ to 6.5″ apart. The included bottom plate (BPL-1098) is drilled to mate to a variety of mounts or mounting adapter plates – including the Tele Vue/Vixen Mount Adapter (AVT-1011) and Tele Vue Gibraltar-5 Head.

For NP127is or any telescope with outside tube diameter of exactly 5-inches.

Nagler Type 6

To achieve various features requires different design tradeoffs and thus the different types of Nagler eyepieces. The largest possible true fields of view for an 82°' apparent field of view in both 2" and 1¼" formats are achieved with the Nagler Type 5 series, with focal lengths of 31 and 16 mm

Specifications

Specifications

The Nagler eyepiece was revolutionary as the first eyepiece to deliver breath taking wide fields of view while still providing sharp images from edge to edge.

The eyepiece is an extremely important, but often over looked element in the image your telescope delivers.

In contrast to the objective of your telescope which rarely covers an image angle of more than 2°, the eyepiece has to remain sharp over an angle of more than 50°...or a staggering 82° in the case of the Nagler. For this reason extreme care must be taken to correct for aberrations - especially away from the optical axis.

Astigmatism and field curvature are 2 factors that most influence the off axis sharpness especially in "fast" objectives (below f/6). Eyepiece designers had tried for many years to eliminate these aberrations but it was not until the 1980s that a breakthrough occurred - the Nagler eyepiece.

Since then Al Nagler has refined this series of eyepieces taking advantage of different exotic glasses and improved coatings to deliver quite simply the best performance you can get out of an eyepiece. While other manufacturers may boast impressive field sizes, Televue's philosophy of "showing no field unless it is fine" stresses full field image quality as the ingredient for impressive views.

Tele Vue Nagler 22 Specifications

Review

The TeleVue 22mm Nagler Type 4 is another of the newer improved Naglers.

The 19mm of eye relief as well as TeleVue's "Instadjust" click-stop adjustable-height eyeguard with a soft fold-down rubber eyecup allows for eyeglass wearers to experience a full 82° apparent field of view when fully retracted. The click stop increments of "Instadjust" allows non eyeglass wearer to find the exact height for full field of view images. A small plastic insert that fits in the eyeguard allows non eyeglass wearers to find the correct position of the exit pupil.

In big, fast Dobs this is an amazing medium-low power eyepiece great for open clusters, galaxy clusters and emission nebulae. Eta Carinae is totally awesome in this eyepiece.

In SCT's it offers 2.2mm exit pupil making images very bright and this is ideal for open and globular clusters. Have a look at the Tarantula Nebulae to be convinced how good this eyepiece is.

The 3.5mm Nagler Type 6 is a natural progression of 1.4x power steps from 7mm and 5mm Naglers. You don't have to sacrifice field in order to gain sharpness and power. And, you're not limited to slow scopes, or have to squint through tiny eye lenses. These are the lunar and "planetary" eyepieces with field to spare.

Nagler Type 6

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 Dobsonian/Newtonians can enjoy a larger true field, free of secondary shadowing, than ever before. For example, a 12.5", f/4.5 scope with a Paracorr will deliver a 1.5 degree field (3 Moon diameters), at 53x with a 6mm exit pupil.

Why Are There 4 Types of Naglers?

To achieve various features requires different design tradeoffs and thus the different types of Nagler eyepieces. The largest possible true fields of view for an 82°' apparent field of view in both 2" and 1¼" formats are achieved with the Nagler Type 5 series, with focal lengths of 31 and 16 mm

Compact size in medium to short focal lengths is achieved with the Nagler Type 6, available in focal lengths of 13, 11, 9, 7, 5, and 3.5 mm.

To achieve eyeglass friendly eye relief without excessively large and heavy designs requires the other two Nagler types. The 22mm Type 4 and 19, 14, 9, 5.5 mm Type 7 with their long eye relief feature adjustable height eyeguards and are best for eyeglass wearers or Dioptrx™ users.

Specifications

Specifications 

Nagler Type 6