TeleVue - 13mm Ethos Eyepiece 100° Apparent Field-of-View!!!

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 (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.

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; 100° 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 82° 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: 100°
    * Focal Length: 13mm
    * Effective Field Stop: 22.3mm
    * Eye Relief: 15mm (accepts DIOPTRX™ eyesight astigmatism corrector)
    * Barrel Size: 2"/1.25"
    * Weight: 1.25lbs.