> ... 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.

Hi Gerard,

Have you read these threads?

 http://www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=006SBz
 http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=002UKe

Could it be the effect of the E-TTL program to balance ambient exposure
against flash?

Cheers
Julian Loke
P.S. Which exposure gave the right results on film?
P.P.S. I have now taken to using multi-unit wireless E-TTL flash to control
the subject and background exposures separately. Will post when I have this
thing figured out.

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