If you ever run across a film that is significantly different in
reflectance, you will know that you need to adjust your exposure index
within a couple of rolls if you look at the negatives or chromes
critically. Perhap that is part of the reason that many of us shoot
negative films at a lower than rated exposure index while shooting
chromes at or above rated speed. Then again, maybe not since I use the
same exposure indices for manual or automatic exposures.
Incidentally, one film that I expect is of different reflectance is
Kodak High Speed Infrared since it lacks the anti-halation coating. But
that is academic for me since I never shoot automatic exposures with
HIE.
Gary Edwards
>From owner-olympus@xxxxxxxxxxxxxxx Thu Feb 18 10:39:41 1999
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>OK, putting on my research hat, here is my primary reference of film
>reflectance in relation to metering tolerance in the OM-2 and
subsequent OTF
>metering cameras (from The Olympus Way, p. 115):
>***
>The exposure meter system [referring to the OM-2] only has to be
programmed to
>allow for the film speed and for a standard film reflectivity. Various
tests
>by Olympus, by other camera manufacturers studying film reflection
metering
>and by independent reviewers suggest that the reflection
characteristics of
>most films likely to be used in the OM cameras are remarkably
consistent. The
>source of error contributed by film variations thus appears to be
rarely more
>than +/- 1/3 lens stop and often much less.
>***
>One of the independent reviews that L. Andrew Mannheim cites is
probably
>Modern Photography's original OM-2 "Modern Tests" If memory serves me
right,
>he was an editor or European correspondent to Modern Photography in the
>1970's. If anyone has that review, there is probably additional
information
>there.
>
>Mannheim never addresses the question of what was considered average
film
>reflectivity at that time.
>
>Gary Reese
>Las Vegas, NV
>
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