I finally solved that peculiar problem I had with an old Vivitar T-mount
300/5.6; mentioned a month or so ago. Turns out that when I removed the
existing adaptor (marked "CS") I only removed *part* of the mount. So when
I attached the new adaptors (OM and FD) the remaining portion of the old
adaptor acted as a small extension ring, thus making a 300mm macro that
wouldn't focus to infinity. Not quite what I wanted.
A fellow at Arlington Camera - apparently experienced at strangling bears
and alligators - twisted that ring off pronto and solved the problem for me.
Now I have another problem, easily diagnosed and solved. A tiny screw
that's attached to the lens release button of the generic OM adaptor extends
too far inside the adaptor ring, preventing the lens from seating fully into
the adaptor. A quick buzz with a moto-tool or jeweler's file will fix it.
I'm still trying to figure out what camera the original T-mount adaptor was
for. Which cameras used a 42mm coarse thread? It's not for the Pentax
Spotmatics or similar fine thread mounts. The "CS" marking must be some
sort of hint, but "Coarse Screw" is the only thing I can think of ... which
just goes to show how my mind works.
Lex
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