In a message dated 98-03-06 05:59:36 EST, you write:
<< 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. >>
I consider mirror lock-up essential whenever I use my 50-250 because the
weight and length of that lens seems to amplify all vibrations, not just those
induced by the mirror. In fact, I would attribute this vibration to the lack
of quality some have experienced with this lens. I myself was unenamored
with it until I started using the lock-up with discipline. Now, I feel it is
a very sharp lens, sharper than most other good zooms (sharper than a vivitar
70-210 2.8-4.0 series 1 at 180mm, 'cus I tested it) when used with the lock-
up.
Greg Logiodice
Nyack, NY
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