Hi all,
The other day I was taking some macro photos with some photofloods and
flash combined. 550EX and EOS30.
I was using Av to meter and then setting the exposure value in M mode
and shooting away. The funny thing was that with Av I got an exposure of
4/f8 and setting that in M gave me -1/2 underexposure. In M the
"correct" exposure was 2/f8. I took care of closing the eyepiece
completely and try again with the same result.
Then, I turned the flash off and both exposures were equal.
I was using partial metering all the time.
Any guesses of what's going on? I've used the same technique many
times already and it's the first time I see such extrange thing.
regards,
Gerard.
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V Gerard MAAS Senior Research Engineer
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