Tele-vue 8mm Ethos Eyepiece Manuel d'utilisateur télécharger pdf

Tele Vue Optics, Inc., 32 Elkay Drive, Chester, NY 10918 845-469-4551 V4/3/2009

8mm ETHOS EYEPIECE INSTRUCTIONS

Tele Vue 8mm ETHOS Specifications:

Apparent Field: 100º

Focal length: 8mm

Effective Field Stop: 13.9mm

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: 0.95 lbs.

Thank you for purchasing the Tele Vue 8mm 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 and 1¼"

Panoptics.

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. Firmly lock the 8mm ETHOS in the 1¼" Paracorr adapter with the tunable

top set to the 4 setting in the slot.

Note: when using a 1¼" filter in the 8mm 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 8mm ETHOS.

Warning: Do not unscrew any sections of the eyepiece, as the lenses may fall

out, thereby voiding the warranty.

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Tele Vue Optics, Inc., 32 Elkay Drive, Chester, NY 10918 845-469-4551 V4/3/2009 8mm ETHOS EYEPIECE INSTRUCTIONS Tele Vue 8mm ETHOS

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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 Ba

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