Hi all,
Being me who posted the original question, I should say that I'm more
confused than at the beginning.
> When the focus mode switch on the lens is set to M, the
> E-TTL flash meter reading is averaged across the entire
> metering sensor and the ambient meter reading is taken in
> evaluative mode as if the center focusing point had been
> selected.
AFAIKnew, even in with the lens in (M)anual mode you're able to chose the
focusing point from which you want the metering to be taken of. At least
in my EOS50E this is possible using a CF (CF-8). The manual says that the
"active" focusing point will be used for the calculations. It's my
experience that manually changing the focusing point works for the Flash
metering, but I'm not sure on *how* the selected metering method was
affecting the flash exposure.
Would you like to test it? Plase a white card in front of the leftmost FP
and a black one on front of the rightmost. Now with the lens in (M)
alternate from one to the other by manually selecting the active FP. Take
a picture with the left, center & right point.
IF the camera is always defaulting to the center point the series of 3
pictures will be ABSLUTELLY the same.
IF the flash exposure is based on the selected focusing point, you will
get three differently exposed frames.
It's up to you to expend 3 frames from a film to figure it out.
MY problem is that those simple tests don't show anything about the effect
of the metering mode used. I couldn't draw any conclusions on that
subject.
I hope somebody can throw some light on this subject.
Greetings,
Gerard.
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