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TeleVue 13mm Ethos Eyepiece
Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler. Their 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.
| Item # | Product | Stock Status | Price | Shipping | |
|---|---|---|---|---|---|
| ETH-13.0 | TeleVue 13mm Ethos | In Stock - Ships Same Day (business days)  | $650.00 |  |  |
Announcing the Amazing Ethos!
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.
Ok now - enough of the party line...
Our first encounter with the new Ethos eyepiece was at the 2007 Northeast Astronomy Forum. Al Nagler called us over to have a look at something new, just before the doors were opened to the public. There in the focuser of an NP-101 we found an eyepiece with familiar Tele Vue green lettering yet a very unfamiliar shape. One way to describe it would be to say that someone had taken a familiar 12mm Nagler and stretched it lengthwise.
Stepping up to the eyepiece, we were introduced an incredible 100º apparent field. The target images provided by Tele Vue showed the image to be tack sharp across the entire field of view, even in the fast f/5.4 NP-101 refractor. The true field of view delivered by this eyepiece approaches that of a 16mm Nagler. The Tele Vue Ethos performs the function of 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.
Subsequent to NEAF, Tele Vue has been touring the country and demonstrating the Ethos eyepiece at regional star parties. Customer feedback from this field testing has been nothing short of incredible. The general consensus of customers who have actually observed with this eyepiece is "how soon can you get me one?"
| Optical Specifications: TeleVue 13mm Ethos Eyepiece | |
|---|---|
| Focal Length | 13 mm |
| Apparent Field-of-View | 100° |
| Eye Relief | 15 mm |
| Physical Parameters | |
| Weight | 19.8 Ounces |
| Barrel Diameter | 1.25 and 2 Inches |
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