>
> What I'm totally in the dark about is how the evaluative metering
> handles a scene when manual focusing.
>
> Specifically, does the currently selected focusing point (though not
> necessarily being utilized) still weight the exposure or does the meter
> simply attempt to balance the entire scene?
>
I don't know the answer, but when I read this post there was an EOS 1V
sitting right next to me with a 28-70L lens on it loaded with ISO 125 film.
So I tried the following highly unscientific experiment.
I was near a bright open window in an otherwise dark room. In 'P' mode with
the lens set to 70mm, I pointed the camera so that the left edge of the
window was going right down the center of my frame, splitting it into a
bright half and a dark half (I use the focusing screen with the grid on it,
which has a center line).
I selected the leftmost focusing point on the middle line, and auto-focused
on something on the wall inside the window, i.e. in the dark half of the
frame. I pressed the AE lock button and got a reading of 1/60 at f/2.8.
Without moving the camera I selected the rightmost central focusing point,
and auto-focused on something outside the window in the bright half. I
pressed the AE lock button and got a reading of 1/160 at f/4.
Without moving the camera, I flipped the switch on the lens from AF to MF.
The lens was focused on the same object outside the window. I pressed the AE
lock button, and got a reading of 1/100 at f/3.2.
It proves nothing, but it makes me guess that in manual focus mode the
camera disregards the selected AF point and goes to some fixed full-frame
weighting formula.
--Ken S.
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