Bob,
I have a 55/1.2 and a 35/2 that cause the same problem with my OM4T. In my
opinion there is a problem with some fast lenses. It seems that closing the
aperture takes to much force for a OM4(Ti). My OM2 and OM1 work nicely with
these lenses and I have some other fast lenses that don't show the problem
with the OM4T.
I allways figured it was a 'normal' thing for old fast lenses (mine are
really worn out, no need to bother repairing these) but a 90/2 can't be that
old ...
pressing the depth-of-field preview button a few times in advance sometimes
seem to solve the problem.
Daan
Pictures of Insects at:
http://www.kalmeijer.net
>
> Lots of mirror hang-ups with the 4Ti. .....
> This suggests to me the problem
> may actually be in the lens rather than the camera, because since getting
> the 90 macro, it's all I've shot with. The camera has hung a few times
with
> other lenses as well, but nothing like with the 90.
>
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