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Mike/Davo,
for E/P projection I simply screw the 1.25" - ToUcam adaptor onto the rear of one of my orthos. The weird thing about the Zeiss orthos is that the circular ring at the eye end unscrews leaving a thread. this thread is used to screw filters (either singly or as a turret) onto the end of the eyepiece. The thread is about 24mm. In a quirk of fate, we (Robbie and I) got a heap of 1.25" adaptors made locally when we first got a ToUcam. The central hole was just a shade under 24mm, and I got the appropriate 24mm thread cut to allow this feature. I use it all the time now.
As for focus, if the eyepiece comes to focus it will also allow E/P projection, or will in my case.
As for the most used focal lengths, I find that the 5x Powermate is approximated by the O-6mm, and the 2.5x by around the O-12.5 or O-16mm. Of course if the seeing isn't too flash I can use the O-8mm, or O-10mm.
Would a picture help?
Gary
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