An OM-2 in 'Auto' mode (OTF) does its metering over the shutter curtain
and/or the film, so the focusing screen won't affect the exposure. However,
the metering in 'Manual' mode _and_ the needle indications in 'Auto' will
show about 1 f/stop more light.
If you shoot in 'Manual', you may set the exposure compensation dial at
+2/3 or +1 to get correct exposure. In 'Auto', better get _no_ compensation
(exposure will be OK) but have into account that the needle will read one
stop faster -- if it reads '250', actual exposure will be around 1/125.
------------------
Carlos Santisteban
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