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?"
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