> "Thomas Bantel" <[EMAIL PROTECTED]> wrote: ...
> All I can read out of it, are the definitions of four distinct
> zone-clusters, depending on the active AF sensor. There is no
> information what the camera actually *does* with the
> zones/clusters. IMHO, an algorithm as simple as that (weighted
> averaging) would not have been called "evaluative" metering, ...
> Also, evaluative metering existed already in older bodies which
> had just one AF sensor in the center. ...
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.
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.
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). 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.
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."
Cheers
Julian Loke
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