Oh, but it does. The OM-4 offers mirror and aperture pre-fire via its
self-timer which the OM-2 does not. If you peruse Gary Reese's OM lens
tests you will see that, within a certain shutter speed range, tripod
shots made with mirror and aperture pre-fire do indeed exceed the
quality of shots made without it.
<http://web.archive.org/web/20050208000949/members.aol.com/olympusom/lenstests/default.htm>
Vibration is particularly noticeable with certain lenses like the 200/4.
Gary's comments on the 200/4 test using an OM-1 say:
"Notes: Low mass of OM camera body probably results in camera shake for
shutter speeds of 1/60 to 1/2 sec., in spite of tripod, cable release
and mirror lockup precautions. Better wide open performance
attributable to lack of additional vibration from the automatic diaphram."
It was Gary who discovered this bad OM body behavior which shows that
the vibration from opening the lens diaphragm is much worse than that
from the mirror slap. If Olympus knew about it they never admitted it
and you will not find such things mentioned in the manuals of cameras
whose self-timers activate mirror and aperture pre-fire. In fact, prior
to Gary's tests the 200/4 had a reputation of being a bit of a dog. It
took suppressing the vibration from the camera to show that it is
actually a fine lens.
If you shoot from a tripod in the range of 1/60 to 1/2 second you'll
want a body with mirror and aperture pre-fire. As identified by Moose's
last message they are the OM-2Sp, OM-4 series, OMPC and OM2000 bodies.
Chuck Norcutt
Dawid Loubser wrote:
> Wow, DrT, for "the new guy" you really got yourself a bunch of gear...
> You "think you have a couple of OM-2SPs"?? :-) This man has serious
> zuikoholism already...
>
> Anyway, for stereo, with manual metering, it is my opinion that an
> OM-4 will not give you anything over an OM-2, except perhaps for the
> fact that the viewfinder of the OM-4 offers built-in diopter adjustment.
>
> Dawid
>
> On 12 Aug 2009, at 6:41 AM, DrT (George Themelis) wrote:
> <snip>
>> I think I have a couple of OM-2Sps, I'll check.
>>
>> Do I need an OM4? I do not really care for the stop metering. In
>> stereo, I
>> prefocus and set the apertures and shutter speeds identically in both
>> cameras. What else will the OM4 give me?
> <snip>
>
--
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