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TeleVue 13mm Ethos Eyepiece 1.25 & 2.0"


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Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepiece brings new meaning to the term “in-house.”
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From S&T's Hot New Products for 2008
Observers have long sung the praises of low-power, wide-field views of the heavens. But that's misleading. Wide-field views are spectacular, but "low-power" got there because years ago only low-power eyepieces could show a wide field. In reality, higher magnification always provides a darker sky background, shows fainter stars, and delivers better resolution. Experienced observers usually select the highest magnification eyepiece that still has enough field of view to encompass their target. Enter Tele Vue's 13-mm Ethos, the first astronomical eyepiece with 100° apparent field of view. For a given magnification, it shows 50% more sky than the previous widest-field oculars. You can read all the details of this remarkable eyepiece in our review in last October's issue, page 41.
—Sky & Telescope, January 2008

Tele Vue is known for its in-house eyepiece and telescope designs by Al Nagler; our 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.

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.

At the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe and introduced a new observing experience; 100º of pure Tele Vue quality. With a 13mm focal length evoking the original “Nagler” revolution, the field area of this new eyepiece is more than 50% larger than an 82º 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.

We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.

Tele Vue 13mm Ethos Specifications

Apparent Field: 100º
Focal Length: 13mm
Effective Field Stop: 22.3mm
Eye Relief: 15mm (accepts DIOPTRX™ eyesight astigmatism corrector)
Barrel Size: 2”/1¼”
Weight: 1.25lbs.

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