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Tele Vue 17 mm Ethos 2" Eyepiece with Free Case - ETH-170

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Includes Free Eyepiece Case

Receive a free eyepiece case when you buy this eyepiece from High Point Scientific! You will love the way the two piece “bolt-style” case threads together to securely protect your new eyepiece from dust, moisture, and scratches during storage.

Tele Vue 17 mm Ethos 2" Eyepiece

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.

The 17 mm Ethos is an ideal complement to the 31 mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31 mm Nagler Type-5 has exactly twice the true field area.

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. Sharp images are inherent to the optical design, but 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. Apparent Field of View provided will be 100° or 110°, depending on the model chosen.

Tele Vue 17mm Ethos Eyepiece Specifications:

  • Focal Length: 17 mm

  • Barrel Size: 2"

  • Apparent FOV: 100°

  • Eye Relief: 15 mm

  • Field Stop: 29.6 mm

  • Weight: 1.55 lb