Christos Stavrou wrote:
> Oh I see.. thank you!
> Especially interesting is the pre-firing of the shutter!..
>
Not shutter, aperture.
> Aaah!... that's why the same sample often seems to perform less well
> in an OM-1 than an OM-2000 lets say.. Just to confirm then, if I have
> understood well, and regarding normal photography not only tests, to
> get this benefit of additional sharpness (by escaping much of the
> vibrations) as it specifically occurs in OM2s, 4s and 2000s, we do
> have to use the auto-timer -if possible, don't we?
>
Yes, you have to use the self-timer, which is impossible for had held
photography or people photography in general. However, the whole
business in a non issue with hand held photography. Hand holding both
introduces unsteadiness that may easily be greater than the vibration
effects of mirror and aperture actions while at the same time, your
hands and arms rather efficiently damp mechanical vibration in the
camera/lens combo.
It's also largely a non issue with flash, as the very short flash
duration will stop the vibration motion as well. The amount will depend
on the flash. Most camera mounted flashes have very short durations,
while some big studio units are considerably longer.
Gary's results were also affected by his technique. With fixed film
speed, certain shutter speeds were regularly associated with certain
apertures. So lenses that were particularly prone to vibration caused at
certain shutter speeds could look worse than others that weren't. The
dynamic mechanical effects of aperture stop down are different at
different apertures, for example. If he had used 200 speed film, instead
of 64, it might have been different lenses, or different apertures, that
were affected. He also shot in several different venues, which probably
had different illuminations.
My basic feeling about these tests s simply that one should be aware of
the problems vibration of lenses of certain focal lengths had under this
particular test methodology and only fret about it if you are going to
be photographing things under similar conditions. When working on a
tripod, just follow Oly's advice about how to hold and fire the camera
and things are just fine.
Moose
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