Metering tied to eye tracking
RDKirk
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Re: That would be the evaluative metering
drsnoopy wrote:
Sittatunga wrote:
It's fairly strongly biassed towards the focus point. I like that better than spot metering at the focus point. A small enough spot for actual spot metering would be too easily thrown out by the local high contrast you need for accurate metering. (In the case of eye AF, would it be metering the pupil, the iris or the white of the eye? Surely you would want it to be metering mostly the face, which is effectively what Canon's evaluative metering does.)
Evaluative metering biased towards the focus point can also be a problem. For example if you are manually focus stacking a landscape - say two exposures, one for foreground and one for distance - moving the focus point changes the exposure, often by 2 stops. You have to remember to switch to manual.
That "bias" isn't so much a matter of weighted metering (as with "center-weighted") but information to the system that the subject is located at that point. The system can also recognize and evaluate certain types of lighting patterns, such as back lighting, spot lighting, et cetera, in which knowing the location of the subject provides information for a correct exposure.
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RDKirk
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