The 8mm TeleVue Ethos: an ideal high-power eyepiece for big Dobs
April 26, 2008 - TeleVue unveiled what was then the newest member of the
Ethos family. OK, so what is our impression of this new Ethos? Don't ask me
why, but personally I found myself even more impressed than I
did with the original Ethos when it debuted last spring.
Perhaps it was the target we observed through the eyepiece, a
holiday card with brightly colored crystals embedded in the
printed surface. Using a TV60 with a single eyepiece and a
TV85 with BinoVue, the Ethos revealed a wealth of detail and
color that is simply hard to describe. I walked away
wondering what Jupiter would look like this summer using the
New Ethos and an apochromatic refractor.
So how dooes the Ethos perform under dark skies? We recently had the opportunity to use this eyepiece in a number of big Dobsonian telescopes in the 16 to 20 inch class, and were simply amazed by the image scale on familiar objects such as the Dumbbell and Swan Nebulae. The incredible 100 degree apparent field allows you to push the magnification on clusters of galaxies while still keeping the grouping comfortably within the field of view.
Tele Vue 8mm Ethos Specifications
Apparent field: 100°
Focal length: 8mm
Effective field stop diameter: 13.9mm
Eye relief: 15mm (accepts DIOPTRX eyesight astigmatism
Barrel size: 2"/1¼"
Black barrel diameter: 53.4mm
Weight: 0.95 lbs (15.2 oz.)
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