Julian Loke wrote:
>
> Sorry, the translation URLs were on a previous post. Here they are:
>
>http://world.altavista.com/tr?lp=ja%5Fen&tt=url&url=http%3A//www.canon%2Dsales.co.jp/7/product/point4/index%2Dj.html
> and
>
>http://world.altavista.com/tr?lp=ja%5Fen&tt=url&url=http%3A//www.canon%2Dsales.co.jp/7/tech/page/p03.html
>
They don't work for me. Anyway, I got your idea to use babelfish
and had it translate the pages. But I'm still not under the
impression it is as simple as you may think. 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, there would have been a more precise name for it, maybe
something like "advanced center weighted" or something the like.
Also, evaluative metering existed already in older bodies which had
just one AF sensor in the center. This would make evaluative and
center weighted metering the same on these bodies, but it isn't.
The readings are quite different sometimes. So I still think there
is more to it than just a center weighted metering with "center"
around the active AF sensor. While this is likely part of the
algorithm, it's probably not the whole thing.
> Systran gives the following translation for the four colours:
> . Main subject photometry area
> . Intermediate photometry area
> . Peripheral photometry area
> . Non-photometry area
>
I vaguely remember having read something similar about the
metering of my old Elan (100) somewhere (Manual or Magic Lantern
guide or ?). But again, this camera has one sensor, but both,
evaluative and center weighted averaging metering modes.
> It looks EXACTLY like the centre-weighted metering pattern, except
> that the "centre" is on the active focussing point.
>
The pattern is the same, but not necessarily the evaluation.
> If this were so, evaluative metering would be *very* predictable, and
> exposure compensation could be applied intelligently.
If this were so, it would be a "feature" of newer bodies only. Otherwise,
evaluative metering on my cameras should be much more predictable. ;-)
Thomas Bantel
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