Vibration was the largest factor. As Gary's tests proceeded he began to
realize just how much vibration was causing image deterioration. He
began to realize that simply locking up the mirror on an OM-1 wasn't
sufficient for the best results. Much additional vibration was coming
from both the shutter and especially the kick from the aperture
mechanism closing down.
Using later model bodies (such as the OM-2s and later) with their
aperture pre-fire when on self-timer significantly improved the results.
The best body was actually the OM-2000 although I think the only
reason was the availability of a 2 second delay on the self-timer. I've
never owned an OM-2000 but I think it also has a faster flash sync speed
which may mean a vertically traveling shutter. That might also have an
effect. Maybe others remember better than I do (not hard, y'all).
Of special interest is the 200/4 which gets rather poor results on an
OM-1 with just mirror lockup. It looks as though it's a lousy lens. In
fact, the only problem is that there's some sort of sympathetic
vibration with that lens. Check the later results and especially when
mounted with the Bogen telephoto lens support and you'll see it actually
has very good performance if you can keep it from vibrating.
Chuck Norcutt
Christos Stavrou wrote:
> I have a question about the results of these tests in several zuikos..
> How come, the same lens performs differently in different camera
> bodies? What factors should we consider?.. camera shake I guess, but
> what else?..
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