> I have done several tests on mirror lockup using a tripod mounted OM-1n. At
> focal lengths less than 300mm, or shutter speeds faster than 1/60 sec, I
> could not see any difference in sharpness. I did see differences at longer
> focal lengths only if the shutter speed was in the 1/8 to 1/30 range.
> Slower than 1/8 didn't seem to matter. When I scaled this up to my
> telescope (fl=2800mm) the same pattern was repeated, except the slower
> ranged pushed down to 1/2 sec, probably due to the dampening differences in
> the telescope's mounting.
John Shaw (aka "Yoda") describes 1/15 to 1/8 as the speeds where mirror shake
is significant. Greater or less than this is does not matter. I still lock up
whenever possible. Call me purist.
Foxy
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