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Hello Fred,
I appreciate your input! I think you misunderstood my first post. I am not running out of back focus...my problem is that there is no way that I can see to mount the AP focal reducer to FT 2" focuser. This is a very nice rack and pinion focuser with a microtouch motor. it seems I would have to give up on it for either a 3" FT, or an Optec as you suggest. My bank account is protesting. I am speaking about the AP27TVPH. I have not looked at the FR you mention but I suspect it needs a similar mounting solution.
Re back-focus, the Optec Lepus requires 100 mm. The ONAG would consume 66, my camera with T thread 36.5 = 102.5 mm. But, this does not count extra space needed to attach the Lepus FR to the ONAG, thus my comment that the 27TVPH looked better because it would give me 118 mm to play with. I will have a look at the FR you had success with! Many thanks for that.
Peter
PS. I just looked at your photos. Superb and inspiring!
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