In all the discussion of the probability and/or suitability of a digital
back for our OM's no one has yet mentioned the problem of OTF light
measurement for auto exposure control. I don't know what the roll-over
point is between measuring off-the-curtain and off-the-film but I'm
pretty sure we're there by 1/60th of a second. So, unless the silicon
surface just happens to be pretty close to film in reflectivity there
would be exposure error for most slow speeds including all auto flash work.
Perhaps it can all be compensated for by dialing in a compensating ISO
level. However, that assumes there is at least enough reflection from
the silicon to avoid problems with meter sensitivity.
Chuck Norcutt
Woburn, Massachusetts, USA
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