12.5 mm Ultima or UO Ortho?

Started by kulginov, 11/20/2004 09:01PM
Posted 11/20/2004 09:01PM | Edited 11/20/2004 10:44PM Opening Post
Thanks for the replies!

Perhaps I should elaborate on orthos. I have a 4mm UO ortho that I love dearly, and don't find the tight eye relief to be a problem - as long as the exit lens is small and fits between the eyelashes. I guess the lens is small enough all the way to 9mm. At longer FL the lens becomes larger, but so does the eye relief. I'm pretty sure that at 18mm the eye is farther away from the lens than the eyelash length, but at 12.5mm I'm not so sure. I've got a Surplus Shed 12mm eyepiece that is pretty good, but has this problem - I have to clean it rather often.

Anyone with long and greasy eyelashes?

Dmitri
Posted 11/20/2004 09:24PM #1
The 12.5 UO Ortho is quite good. I thought that the eye relief was not that tight myself. The Ultima and Ultrascopics are also quite good, with the Ortho being just a little better on contrast in my opinion. The FOV in the Ultim, Ultrascopic was a good advantage however, especially if you have a push-to scope.
Let us see if others agree.
Floyd

[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue grin
Amateur Imager
Posted 11/20/2004 10:46PM | Edited 11/20/2004 10:48PM #2
Oops, I managed to edit my original post instead of posting a reply...
Please check it out.

Dmitri