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Tele Vue 13 mm Ethos 1.25"/2" Eyepiece - ETH-130
Free Threaded Eyepiece Case with Purchase!
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 13 mm Ethos 1.25"/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.
Tele Vue have not specifically endorsed the 13 mm Ethos for Bino-Vue use because of the large diameter barrel. However, since many customers have been thrilled with the bino-experience, they 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 production) Tele Vue decided to make this small change public.
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 Ethos Eyepiece Specifications:
- Focal Length: 13 mm
- Barrel Size: 2", 1.25"
- Apparent FOV: 100°
- Eye Relief: 15 mm
- Field Stop: 22.3 mm
- Weight: 1.30 lb