Something like that. There isn't enough flange thickness to allow
removing enough material to justify the effort. The amount of movement needed
by the catch release dictates the body thickness. For the OM lens release it's
a sideways action, so you need far less body thickness.
I just received my two OM extension tubes in the mail, and tomorrow I
should be able to post some results. Looking though all of the books that I
have on nature and close-up photography I was not able to find any mention of
how to calculate the maximum focal distance for a given extension, but I did
find an equation to adjust the f-stop for a given extension. For 5mm you
decrease by 1/3 and for 10mm you decrease by 2/3. I was already familiar with
the shutter speed adjustments between close-up lenses and extensions, so this
was no great revelation.
>
>But I would expect you and your machine shop to fashion a solution.
>Depending on how deep the springs go on the front side of the pins I
>think you might be able to machine 3mm off the backside.
>
>On the other hand, maybe it's that spring action requirement on the pins
>that makes the minimal depth of the tube 10mm.
>
Chris
When the going gets weird, the weird turn pro
- Hunter S. Thompson
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