I guess that I hadn't had occasion to use my relatively recently-acquired
Zuiko 100 mm f/2 lens on the black OM-4T - until now. That -4T does not
like that lens. Every time the shutter is released, the mirror comes up
part way, the viewfinder goes dark, and . . . . nothing else happens. Until
I bump the DOF preview button, then the mirror goes up all the way and the
shutter trips. On occasion, the camera will function properly if the
aperture is set to f/2. It fails every time at f/2.8 or smaller.
I tried the 100/2 on six other bodies (including an older, champagne -4T) -
no problem, at f/2, f/8, or f/22. I tried every other lens that I have on
the black OM-4T - no problem. That test series included a Zuiko 180/2.8, a
Sigma 70-210/2.8, and a Tamron 400/4, all of which have presumably
comparable diaphragm mass, etc. The 100/2 does have the stiffest feeling
aperture linkage of all of the lenses I have on hand (16).
So, I don't know which unit needs fixing - camera aperture drive or lens
diaphragm? It looks like I'll have to send both off to John, unless someone
has an idea of where the problem is.
Gary Edwards
people, places, flight at http://home.attbi.com/~garyetx/
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