Julian Loke wrote:
>
> Hi Thomas,
>
> You have a good point about how the processing of the information
> may influence the metering result.
>
> For instance, metering to evaluate highlights for slide film or
> digital should weight for the brightest segment within the metering
> pattern. If centre-weighted averaging is an arithmetic average of
> bright and DARK segments, it might be better for print film.
>
Most EOS cameras don't even know what kind of film is loaded. They
would have to read the second line of contacts of the DX code to
know that (exposure latitude). But I agree, it would be a nice idea
to use this kind of information for evaluative metering.
> The single-focussing point EOS 1000FN only had a 3 segment meter!
> And yes, evaluative behaved much like CWM because the segments
> were so large.
>
Yes, I know the 1000 series, had a 1000F myself. 3 segments are
of course not very much, so that there aren't many options for
doing much more than CWM. All it could do is ignoring one or two
zones.
> Even on a body like the EOS 100, I suspect Autofocus and AE-lock
> were linked to the shutter release button (or * with CF-4).
No CF4 on the 100 (Ok, of course it has a CF 4, but it doesn't
move AF to the AE-lock button).
> That means that when you pointed the only AF sensor to autofocus the
> main subject, the metering sensor would be centred over the main
> subject for "evaluative" metering.
Yes. And it has both, center weighted and evaluative metering, which
would be kind of funny if they were one and the same thing.
>
> There is more information (this time in English :-) on Canon's
> EOS-1V promotional site: http://www.canon.com/eos/measure.html
>
> What do you make of the statement:
> "Focus on a subject within the Area AF ellipse, and the EOS-1V will
> meter that area for the optimum result where it's needed most."
Typical spec sheet information ;-) Sounds impressive and says nothing.
This could mean everything, either that it is averaging with the center
around the active sensor or something more sophisticated, which is what
I suspect.
Thomas Bantel
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