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Re: [OM] Vibrations with MLU on OM-1

Subject: Re: [OM] Vibrations with MLU on OM-1
From: Joel Wilcox <jowilcox@xxxxxxxxxxxxxxxxxxx>
Date: Sun, 30 May 1999 09:13:31 -0500
At 09:46 PM 5/29/99 -0400, Doris you wrote:
>
>
>   The test I would like to see would be regarding different styles of
>TRIPODS (using the same camera(s) for consistency). Do braces really
>make THAT much of a difference ? Are the W-leg type tripods any better ?
>Are larger tripods that much more stable ? 
>
>                                Just wondering...
>                                   *= Doris Fang =*
>
>  How much are those laser dealies ?
>

Hi Doris,

I posted some stuff on the effect of the tripod support on 5/5 ("Shutter
Shudders + 200/f4" or something like that). The combination of OM-1 +
200/f4 + long lens support + Bogen/Manfrotto 3221 nullified measurable
shutter vibration, where the critical variable was the long lens support.
I didn't bother using my Slik U212, although I have managed to get some
good results even using that + long lens support with the OM-1 and 200/f4.
The Slik U212 was used by Keppler in his MLU tests. His article mentions
using "Bogen long lens support," but the picture shows a device similar to
Slik's, not the type of Bogen long lens support that Gary used in his tests
(same one I use). I'm not surprised Keppler's results with the OM-1 were
not very satisfactory. I AM surprised Gary's results were poor because I
wouldn't have predicted this based on test shots I have made with the
combination mentioned above.

Since I felt that I got completely stable results with both OM-2S and OM-1
with the rig mentioned above, I saw no further reason to suspect an
unstable tripod.  It doesn't mean that other tripods are not better than
the Bogen, just that I got some predictable and satisfactory results with
it.  If the difference between the OM-1 and OM-2S/4T with regard to
convulsive movement is in the shutter, my hunch is that no tripod in
itself, however solid or stable, will correct this problem (but I sure
could be wrong).

For my test with the laser, I mounted the laser pointer directly to the
lens.  After learning of my results, my brother discovered that he could
reflect the laser off the front element of the lens and project it about 7
meters to his basement wall.  This kind of "magnification" would be more
effective at revealing any telltale vibration and I would recommend it for
anyone doing further testing.  It might explain why my first homebrew tests
suggested that the OM-1 is OK with long lens support and why Gary's test
with the OM-1, long lens support, and 250/f2 were disappointing.  Or it
could show that my OM-1 (CLA'ed in the last year) works better than Gary's.
 Some hypotheses to test.

I'll try to test further for vibration tomorrow when rain is predicted.
For today, I have a garden to plant!



 
Joel Wilcox
Iowa City, Iowa USA

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