The OM system Adaptall 2 OM adapter works well. If you have an OM-4[T]
(uncertain about OM-3[ti]), ensure you get the newer "OL" Adaptall 2
adapter. The old one can shear off the small reset pin on the OM-4 lens
mount with one of its recessed flange screw heads. The newer one has the
screw heads repositioned. No difference as far as lens itself, just the
version of OM Adaptall 2 adapter you put on the lens. The older adapter is
fine with an OM-1[n], OM-2[n] and OM-2S . . . they don't have a reset pin
on the lens mounting flange. BTW, this is something to be careful about
with older non-OEM lenses too. Olympus' OM Zuiko lenses are fine,
regardless of when they were made.
Having purchased two Tamron Adaptall 2 lenses recently, I'm not certain
changing Adaptall 2 adapters is something I'd want to do that
frequently. It's not nearly as easy as changing lenses on the camera
body. Perhaps it's because I haven't learned the tricks for doing it well
yet. My problem is getting the tab lined up on the lens aperture
ring. Always takes a bit of fiddling around to get it on. If it's
somewhat infrequent, and not something you would be doing "in the field,"
but on the dining room table preparing equipment for a shoot, when you can
spend the time to ensure it's mounted correctly, you should be OK.
Also uncertain I'd want to store the lens without an Adaptall 2 on the back
(whether it's OM or some other system). The rear element hangs out
considerably from behind the lens. First thing I noticed when I bought the
first Tamron.
At 03:49 AM 7/16/03, you wrote:
Best I know Douglas is to stick to Tamron Adaptall 2 - they will all fit
with the Olympus mount, which is easy to come by. You will occasionally
find an Adaptall 1 lens, but finding the Adaptall 1 mount for OM is *hard*.
Ignore T-mounts - you can get them for OM easily and cheaply, but the mount
had no auto-diaphragm mechanism, so all the lenses are manual diaphragm.
As to the rest, they are generally not interchangeable mount lenses, so
although you may find the same spec lenses in Pent*x and OM mounts, you
can't switch them.
Piers
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