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> From: Adrian Chinery <adrian.chinery@xxxxxxxxx>
> To: 'olympus@xxxxxxxxxxxxxxx'
> Subject: [OM] Don't forget the body
> Date: Tuesday, April 27, 1999 5:11 PM
> 1. Focusing screen not positioned at the same distance from the lens as
the
> film plane. Therefore although the image appears in focus on the screen
the
> image captured on the film is not. There has recently been a discussion
> regarding the use of other manufacturers screens in OM bodies. I wonder
if
> the thickness of these screen differs from the Olympus originals and
whether
> this causes focussing inaccuracies.
>
I didn't notice any focus different with different FC I have used (some do
have slightly different in thickness). If you worry about the thickness of
FC that affected your focusing, change back to OM's original screen to
check again.
I do found some old camera with focus shift due to position of mirror is
off, check the site below for a method that may be helpful to check and
correct the problem.
http://www.asiaonline.net.hk/~chling/focus.htm
C.H.Ling
> Both of these problems are most noticeable using a lens with a small
depth
> of field (the 90mm/F2 that is receiving a lot of attention here should be
> ideal for this!) and a high resolution film (e.g. Fujichrome Velvia).
>
> Adrian
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