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Phil,
I should have explained that I don't use DSLRs. I don't like them because they are such a 20th century pain, with flip mirrors, ISO settings etc. Hope they will go extinct soon.
So I want to mount this lens on my QHY8 and that is why it needs real manual focus.
JA,
Great link, thanks. Looks like I made the right choice.
Hugh,
Thanks for the feedback. Sounds like I'm on the right track.
Trevor,
Yesterday I ripped out (literally) all the unnecessary parts and turned a jig with an M52x0.75 male thread that allowed me to screw on what remained of the lens assembly and spin it in the lathe to check lens alignment. All that I ended up keeping was the front of the "lens" with the housing of the optics including the iris mechanism. The rest of the mechanical parts, made of plastic, had too much runout for my liking.
I will make a metal back side with a Pentax screw mount and locking ring so that I can interface it to my CCD.
Stefan
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