See Wrotniak's site here:
<http://www.wrotniak.net/photo/oly-e/any-lens.html>
for an excellent discussion of exposure accuracy using 35mm lenses on
the E-1 (and probably other small sensor digitals). Boils down to small
mirrors forming another "effective" aperture so the full width of the
light beam on the 35mm lens doesn't get to the exposure sensor in the
viewfinder. Beam narrows as you close down the lens so exposure
measurement eventually gets correct.
Chuck Norcutt
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