The Tele Vue 13 mm Ethos Eyepiece for both 1.25" and 2" barrels is part of the Ethos Series delivering a 100 degree field-of-view.
At the 2007 Northeast Astronomy Forum in New York, Tele Vue introduced attendees to a new observing experience with personal views through the new Ethos. With a 13 mm focal length evoking the original 'Nagler' revolution, the field area of this new eyepiece is, at 100 degree, more than 50% larger than an 82 degree field. The Tele Vue 13 mm Ethos eyepiece 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 Optics is known for its in-house eyepiece and telescope designs by Al Nagler. Tele Vue's latest eyepiece brings new meaning to the term 'in-house.' The concept for the 13 mm Ethos 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 (technical reference), 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 protege 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.
The Tele Vue 13 mm Ethos eyepiece has now been shown at NEAF, TSP, RTMC, as well as other major astronomy events. The Tele Vue Ethos has been extremely well received by the astronomy community and will be one of the most highly anticipated products to be released in years.
Since it is designed as an 1.25" eyepiece, there is NO optical benefit by using a 2" holder, however, there is a 2" barrel is included just for convenience. The holder is also threaded to accept our Tele Vue's 2" extension tube, which allows the use of 48 mm filters.
OPT Product Number: TE-ETH-13.0
All Tele Vue products are available to ship world-wide from OPT, and effective July 1, 2008, are covered by a Five Year Worldwide Limited Product Warranty! Always be sure to save your original packaging materials should you need to return any Tele Vue product for warranty or repair.