It certainly applies to the super teles. However, Oly included the
phrase in their Sales Information File (The master reference for sales
reps and dealers) for all lenses from the 85/2 on up except the 90/2
(probably an oversite). You can view the online version (eSIF) here
<http://olympus.dementia.org/eSIF/om-sif.htm>
Gary's tests clearly showed that the effect can show up at very moderate
focal lengths. His tests of the 85/2 are of 2 different lenses, but
generally agree with the trend. The 100/2.8 tests of the same lens with
OM-1 and OM-4t show a clear difference AND the OM-1 mirror was locked
up, so this is just aperture closing down. In the tests of 135/2.8s, the
SC on an OM-1 significantly outperformed the MC on an OM-4T. Notice that
the effect is at apertures above f8 for the 100/2.8, and right at the
heart of what should be the lens' best performance, at f5.6-f11 for the
135/2.8. It's different for each lens depending on size, weight and
construction.
Check out the 135.4.5. Note the 35-105/3.5-4.5 at 105mm. Look at the
200mms, well, you get the idea. If you have no life and spend time
cruising through the tests, the issue becomes clear. Gary later said
that, based on later field experience, the super teles proved to be
sharper than his tests indicated, but only when vibration is controlled,
which is quite difficult.
Moose
James N. McBride wrote:
I'm not sure but recall that this advice applied to long telephoto lenses
such as the 600 and 1000mm. The mirror movement causes more vibration when
the camera is cantilevered far away from the tripod mounting device. I don't
remember where I read it.
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