TeleVue ETHOS User manual

Tele Vue Optics, Inc., 32 Elkay Drive, Chester, NY 10918 845-469-4551
6mm ETHOS EYEPIECE INSTRUCTIONS
Tele Vue 6mm ETHOS Specifications:
Apparent Field: 100º
Focal length: 6mm
Effective Field Stop: 10.4mm
Eye Relief: 15mm (accepts Tele Vue’s Dioptrx astigmatism corrector)
Barrel Diameter 53.3mm (ideal for binocular viewer applications)
Parfocal with Tele Vue 1¼" eyepieces
Barrel Size: 2" / 1¼"
Weight: 0.97 lbs.
Thank you for purchasing the Tele Vue 6mm ETHOS, which fits both 2" and 1¼" focusers
or diagonals. Typically, in 2" mode, you will focus “out” about ¾" further than a 26mm
Nagler Type 5, and in 1¼" mode, if you use Tele Vue’s "high-hat" 2"-1¼" adapter, it will
be parfocal with Tele Vue’s Plössls, Radians, Type 6 Naglers, Nagler Zooms, 1¼"
Panoptics and 8mm ETHOS.
Since it is designed as an 1¼" eyepiece, there is NO optical benefit by using a 2" holder.
The 2" barrel is included just for convenience, but it is also threaded to accept our 2"
extension tube (EBX-2120), which allows the use of 48mm filters.
For 1¼"holders:
1) Back off the lock screw in the 2" barrel section of the eyepiece so it can be fully
inserted into the holder.
2) If the holder has a lock screw, rotate the eyepiece so that the screw slips into the slot
in the 2" section of the eyepiece barrel. Your holder lock screw clamps to the 1¼" barrel
of the eyepiece, while the eyepiece lock screw clamps to the outside of your holder for
maximum safety.
3) If your holder doesn’t have a lock screw, be sure to clamp the eyepiece lock screw
onto the outside of the holder. Please note that this eyepiece is heavy, and can fall out of
holders with a “slip fit” unless the lock screw is used!
For 2"holders:
1) Remove the eyepiece lock screw (Don’t lose it!)
2) Use the lock screw on your 2" holder, being careful not to let it slip into the slot in the 2"
barrel of the eyepiece.
3) The eyepiece will not “bottom” on Tele Vue 2" diagonals. Be careful if using diagonals
by other manufacturers.
For Newtonians/Dobsonians:
We recommend our Paracorr coma corrector to eliminate the mirror coma in f/5.5 or
faster scopes. This permits the same kind of full field sharpness routinely seen in Tele
Vue’s NP-Series refractors. See your Paracorr instruction sheet for proper setting.
Note: when using a 1¼" filter in the 6mm ETHOS, be careful not to accidentally set the
Paracorr’s tunable top to its lowest setting, as the bottom of the filter might contact the
Paracorr’s upper lens. It’s best to thread a 2" filter onto the front of the Paracorr, or add
our 2" extension tube (EBX-2120) to the 2" barrel of the 6mm ETHOS.
For higher magnifications with a 100º field, use Tele Vue Barlows and Powermates.
When using the 6mm ETHOS in 2" Powermates, use its 2" barrel.
Warning: Do not unscrew any sections of the eyepiece, as the lenses may fall
out, thereby voiding the warranty.

Tele Vue Optics, Inc., 32 Elkay Drive, Chester, NY 10918 845-469-4551
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 6mm 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
60.0x
1.66
1.00
TV-76
80.0x
1.24
0.95
NP-101, NP-101is
90.0x
1.10
1.11
TV-85
100.0x
0.99
0.86
NP-127is
110.0x
0.90
1.15
TV-102, TV-102iis
146.7x
0.68
0.70
Approximate dimensions of 6mm ETHOS
A. Length of barrel above reference surface (3.5")
B. Overall length below reference surface (1.55")
C. Length of 2" barrel (0.94")
D. Diameter of black barrel (2.1")
E. Depth of 1¼" barrel (1.1")
F. Approx. location of field stop (0.7")
Reference surface is location of 2" barrel seat