Me thinks you guys are being overly severe. I distinctly remember the
200/4 having an apparently sympathetic vibration problem. I haven't
checked all the lenses yet but I did look over a lot of them up to 135mm
and don't see any significant problem there. It's very difficult to get
a true indication of the difference between mirror lock on the OM-1 and
mirror pre-fire on the 2s and up. The problem is that most of the tests
using different cameras also use different samples of the lenses. In
most cases the differences don't amount to a full grade and, since they
aren't paired tests, it's not valid to evaluate one as better than
another. Probably the biggest shock is not the effect of the diaphragm
slap but the performance difference of different lens samples.
Perhaps I'd find more trouble above 135mm but I got tired of looking and
comparing. For hand held shooting I doubt there's a problem at all and,
of course, on a tripod you can generally exert a lot of control.
Chuck Norcutt
Ken Norton wrote:
>> As shown so clearly by Gary Reese in his comprehensive tests of lenses,
>> using several OM body designs, the vibration induced in the Zuiko lenses by
>> the aperture stop-down system was/is so bad as to quite undermine the
>> excellent optics. If you are not familiar with this series of tests, look at
>> the
>> LHS menu at Ken's site http://zone-10.com/cmsm/ and you will find one
>> version of it there. Take a good look.
>
>
> You are absolutely correct! That vibration issue is very severe, but
> does have a few caveats.
>
> 1. When handheld, the aperture stop-down vibration was absorbed by the
> mass of the hands as well as any attached motordrive or winder. The
> weak link then becomes the human's ability to hold the camera steady
> which is another story in itself. Therefore, the stop-down vibration
> was always going to be lesser than other vibration.
>
> 2. When tripod mounted for maximum sharpness, people used self-timer
> anyway to avoid human-induced vibration. Other than the OM-1, OM-3 and
> OM-3Ti, the self-timer addressed this issue.
>
> I almost exclusively use the OM-3Ti handheld without motordrive, but
> the OM-4T is used exclusively with the motordrive and anything
> critical is always tripod-mounted and delayed.
>
> ...it is still a pain, though...
>
> AG
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|