If you are trying to reconcile the focus screen 'focus' with the film focus,
and the mirror angle is correct, then I believe spacers are used between the
focus screen and its bed.
If the mount to film guide distance is off, such that the distance read on
all your lenses is different than the actual distance to an object focused
upon, you have to use the spacers on the lens mount.
Neither seems to be a 'do it at home' quickie type of fix.
As for checking focus, I'm not convinced the 'focus screen on the film
guide' method will give proper results.
Best way is to take camera with fast lens, sit it upon a measuring stick (a
'yard stick' in the USA' with the 0 end at the film plane, and very
meticulously focus the lens at something like the 2 foot mark. You will see
that DOF is very shallow. Take your picture with aperture wide open. You can
study the resulting image and tell if your focus is accurate, and if your
lens marks correspond properly.
Chip Stratton
cstrat@xxxxxxxxx
> >there isn't any way of adjusting the position of the focusing screen in
> >an OM body (is there?). Apart from taking it out altogether, that is.
> >Attempting to adjust the position of the film rails is not something I'd
> >want to recommend
>
> No need to adjust the position of the focus screen or the rails. I
> believe Olympus specifies spacers (washers) to be used between the front
> plate and the body as needed for fine focus correction. Also there are
> spacers on which the pentaprism rests that are interchangeable. Perhaps
> John H or Mark D can tell us why . . . is that for "focusing" the
> pentaprism/viewfinder? My guess is yes.
>
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