> One can test this at home:
>
> 1. Buy a small piece of thin finely-frosted ground glass. I got mine
> by mail order from Edmund Scientific
> (<http://www.scientificsonline.com/Scientifics/>) some years ago.
> Using a glass cutter and steel ruler, cut the glass into a strip 35mm
> wide and perhaps 70mm long. With 220-grit wet-dry sandpaper face up
> and wetted on a large sheet of glass, grind the cut edges of the
> ground glass straight, and smooth any sharp edges or corners off.
Or you can just use that spare 1-13 focus screen. Or any other focus
screen. Just fix it in place over the film gate, matte side towards the
lens. You'll have to turn it slightly diagonally so the corners rest on
the inner film rails and hold it in place with rubber bands and
something to pad out the space between the bands and the screen.
I've used this method successfully to check & adjust the rangefinder on
my 35RD and it should work with an OM too.
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