A popular perennial topic. I assume that the design was changed after
the OM-3 and 4 came out. Whatever the reason, those Adaptall mounts
marked "for OLYMPUS OM" and "O/OM" are all unsafe for these cameras
without filling the screw hole. Those mounts marked "OL" are generally
safe, but I believe someone posted that they had one so marked, but with
the old screw pattern.
It's fairly easy to tell the difference. If you look at the adapter from
the back with the red dot at the top, both types will have scews at 12,
6 and about 8 o'clock. the 4th screw on the BAD ones is at just past 3
o'clock. On the GOOD ones, it is at about 4 o'clock. I thought there
were comparative pics on a site, but don't find them quickly.
Moose
Danrich wrote:
Tamron Olympus Adaptalls:
I was going to put a dot of epoxy on all my adaptalls that pass over
black button on the OM4Ti but I thought I would first see if the screw
heads on the adaptalls would pass over the OM4Ti plastic button.
Surprising to note 2 of 4 mounts I have never pass over the black
button.
Slight difference in adaptalls made for the Olympus I assume.
Is this what you've experience with some of your Tamron mounts?
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