The advantage of the manual extension tubes with an OM-1 is that you have to
close the lens down to the required aperture before you take the picture. Do
that, lock up the mirror and you've got yourself an OM-4...kinda.
> Roger Wesson wrote:
>
>> There was some talk about this recently, I think. Main trouble is that
>> you can't pre-fire the aperture, and this can be a source of vibrations
>> as well. I think that's right anyway - someone'll say if I'm wrong, no
>> doubt.
>>
>
> Has anyone tried manually actuating the aperture on an OM-1 with and w/o
> the mirror locked up to see if this helps? In other words, hold down the
> preview button on the lens with your finger while you trip the shutter.
>
> Dirk Wright
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