Tele Vue 8mm Ethos Eyepiece - Manual (Page 2)

Tele Vue Optics, Inc., 32 Elkay Drive, Chester, NY 10918 845-469-4551 V4/3/2009
For higher magnifications with a 100º field, use Tele Vue Barlows and Powermates. When
using the 8mm ETHOS in 2" Powermates, use its 2" barrel.
Note: As with the Paracorr, do not use a 1¼" filter when using a 2X Powermate, as it will
contact the upper lens in the 2X Powermate. Again, the best solution is to use 2" filters in
front of the Powermate.
If you have eyesight astigmatism, you can add Tele Vue’s Dioptrx Astigmatism Corrector to
ETHOS, instead of using eyeglasses, to get the sharpest view possible (check dioptrx.com
for more details).
We wish you years of exciting viewing with the 8mm ETHOS, and we welcome comments
on your personal experiences.
Here’s a summary of performance with Tele Vue scopes:
Telescope Magnification (x) True Field (°) Exit pupil (mm)
TV-60, TV-60is 45.0x 2.21 1.33
TV-76 60.0x 1.66 1.27
NP-101, NP-101is 67.5x 1.47 1.48
TV-85 75.0x 1.33 1.14
NP-127is 82.5x 1.21 1.54
TV-102, TV-102iis 110.0x 0.91 0.93
Approximate dimensions of 8mm ETHOS
A. Length of barrel above reference surface (3.3")
B. Overall length below reference surface (1.7")
C. Length of 2" barrel (0.94")
D. Diameter of black barrel (2.1")
E. Depth of 1¼" barrel (1.2")
F. Approx. location of field stop (0.7")
Reference surface is location of 2" barrel seat