An OM-2S, OM-4x or OM-2000 will pre-fire the mirror and stop down
mechanism when used with the selftimer. The mirror and stop down will
fire after about 2 seconds thus giving about 8 seconds for the
vibrations to damp down before the shutter fires. Actually, I'm not
100% sure the 2S also pre-fires the aperture along with the mirror but
I'm not at home to check it out. But the stop down mechanism is the
major vibration culprit so be sure to check.
Other means of vibration reduction is to place your hand heavily on the
camera during exposure or use a bean or shot bag.
Chuck Norcutt
Ken Norton wrote:
>> Oh, and another question - what do you guys do to tame vibrations from
>> an OM-1 when using a lens like this for natural-light work? (i.e. shutter
>> speeds anything from 0.5 to 20 seconds) ? I thought my
>> old Linhof tripod was reasonably solid, but even with mirror lockup,
>> at these high magnifications the image is jumping all over the show, almost
>> impossible. Thus, am generally using flash for the moment.
>>
>
>
> The short answer is to NOT use the OM-1. The OM-1 has that little issue
> with the aperture stop-down mechanism that shakes the camera (even with
> mirror lockup) like it's coming off of a high.
>
> An OM-2, 3 or 4 series body (even the OM-2000) will be much smoother in this
> circumstance.
>
> Long answer is to use a LONGER shutter speed. As a general rule, you should
> avoid 1/4 to 1/30 second with all OM bodies, but especially the OM-1. When
> you use a longer shutter speed than 1/4 second, the percentage of the
> exposure that is affected by vibration is greatly reduced. With a 2-second
> exposure, for example, you will have no shutter-vibration blurring.
>
> AG
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