Thanks for input, though I am confused by the differing experiences. Perhaps
to be safe I can get away with a 49-77 step up ring and use a 77mm polarizer
that can serve double duty on the Tamron 80-200? Then I can no longer use the
nice hood which came with the lens unless I use a step down ring. That would
seem to risk the same vignetting problem we were trying to avoid. Suppose can
revert to left hand with a stiff magazine.
Mike
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