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Re: [OM] FS Zuiko 200mm f5(continuation)

Subject: Re: [OM] FS Zuiko 200mm f5(continuation)
From: PCACala@xxxxxxx
Date: Sat, 14 Nov 1998 14:53:49 EST
Hi Angel:

> Both lenses MC ?

Yes, since, as you already know, I have one of the much rarer 200mm f/5
multicoated lenses.  The only SC vs. MC test I am presently doing is the 50mm
f/1.8.  I could see doing a 85mm SC vs. MC test (I'd need an MC example on
loan), since the optical design changed.  But I can't tell the minor
differences in contrast expected from an SC vs. MC of the same optical design.
Since I do the tests in darkened rooms with the subject lite by two floodlamps
and lens hoods on or extended, I have nothing to conclude with regards to
flare.  And subject contrast is too subtile to quantify.  (Note I've stated
when there seems to be a significant difference, but its effect on image
quality is already incorporated in the subjective SQL rating).

Another comment on infinity testing.  All the shots are on tungsten film:
Fujichrome 64T.  I need to hold the type of film constant so as not to
confound the tests with different emulsions.

Someday I might have the motivation to determine resolution values from the
set of slides.  But I don't see me having the time for quite a while!  Nor do
I have easy access to a microscope.

Gary Reese
Las Vegas, NV

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