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Re: [OM] Zuiko 100-200/f5 (was Vivitar Ser.1 70-210)

Subject: Re: [OM] Zuiko 100-200/f5 (was Vivitar Ser.1 70-210)
From: gma <gma@xxxxxxxxxx>
Date: Wed, 02 Sep 1998 10:06:53 -0700
Gary;

Good points.  I did look at the test results on Pauls' site and the 100-200 has
'EX' ratings at the corners at all apertures.  Maybe they 'over-designed' this
one?  Maybe this one sample was better than others?  Ken reports loads of barrel
distortion.  The test says 1.13%, which I guess is relatively high. For
comparison, the 85-250 shows '<1%' and the 35-105 has '0.7%'

The parallel is also interesting, as I have corresponded on the Mamiya list 
with a
Danny Gonzales from New York, who has modified a 250/2 Zuiko to fit his 645, 
with
excellent results.  Although it does not cover the full frame of course.

george



PCACala@xxxxxxx wrote:

> Hi all:
>
> For optical formulas borrowed from the Olympus Pen Fx line, note that they
> only had to cover a 18 x 24 mm frame.  On an OM they are covering a 24 x 36 mm
> frame.  The bottom line is that on an OM there is more image making demand
> being placed on these lenses, outside the originally intended circle of
> coverage.  A parallel would be fitting a 350 mm f/2.8 Zuiko to a Mamiya M645
> (if it works).  The edge definition then becomes suspect.
>
> Gary Reese
> Las Vegas, NV
>
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