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Tele Vue 2" Ethos Eyepiece - 17mm

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Brand TeleVue
Part Number ETH-17.0
Availability available

Product Info

Manufacturer Description

The Tele Vue philosophy (ethos, if you will) has always been about inspiring "spacewalk" vistas by creating both the finest "rich field" refractors and wide angle eyepieces. With their minimum 100-deg apparent field of view, full-field sharpness, and exceptionally high contrast, the Ethos eyepiece line is another step in that direction.

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.

All Tele Vue Ethos eyepieces have proprietary tuned full multi-coatings, blackened lens edges, high index glasses, fold-down eyeguards, rubber grip rings, cover for the eyeguard, an undercut in the barrel for extra locking security, and filter threads. All Tele Vue eyepiece lines are proprietary, in-house designs manufactured to their specifications and tolerances. Every eyepiece is individually tested at Tele Vue to ensure it meets high optical and cosmetic standards.

Ethos Series Development History

Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; their latest eyepieces brings 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 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 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.

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Specifications

Apparent Field of View 100°
Barrel Size 2" (50.8mm)
Bolt Case Included Yes - Free Agena Eyepiece Container
Bolt Case Size Agena 65x120mm
Coatings Fully Multi-Coated
Max Width 2.4" (61.0mm)
Eye Relief by Design 15mm
Field Stop Diameter 29.6mm
Filter Threads Standard 2" Filter Thread (M48 x 0.75)
Focal Length 17mm
Parfocal No
Rubber Eye Guard Yes
Blackened Lens Edges Yes
Additional Information

- Suitable for use with Tele Vue Dioptrx / digiscoping

Manufacturer TeleVue
Eyepiece Focal Length 15.1mm - 20mm
Eyepiece Field of View Over 80 degrees
Eyepiece Series Tele Vue Ethos
Barrel Type With safety undercut
Eyepiece Weight 24.80oz (703.07g)