Tele Vue 10mm Ethos Eyepiece - 1.25"/2

Article number:	ETH-10.0
Availability:	More on the Way to us
Delivery time:	More on the Way to us

 

The 10mm ETHOS fits both 2" and 1¼" focusers or diagonals. Typically, in a 2" focuser, you will

focus “out” a bit (about 3/8" further than a 26mm Nagler Type 5), and in a 1¼" focuser, you’ll focus

“in” about ½" inch further than a 25mm Plössl.

The 10mm is parfocal with the 13mm ETHOS.

Note: the in-travel may prevent focusing in some refractors when using the Tele Vue 60º Everbrite

diagonal, which has an unusually long optical path.

Since it is designed as a 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 EBX-2120 2" extension

tube, which allows the use of 48mm filters.

Its 59mm rubber grip diameter makes this model usable in binocular viewers -- for most people.

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 (if desired) 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. You can use the 10mm ETHOS 2" barrel in the Paracorr with the

tunable top raised to its maximum, mark 1 on Paracorr slot. However, you can get closer to ideal

coma correction by using the 10mm ETHOS in a high-hat 2" to 1¼" adapter (part ACR-2125 or satin

finish ASF-8125) and setting the Paracorr to its full down position, mark 5 on Paracorr slot.