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Anonymous
>>176483 Metering tells you what exposure will have something work out to middle grey.
Matrix metering- the default on most modern cameras- employs some arcane algorithim, weighting the proper exposure for different parts of the scene to try to get one to come out right. If you know what you're doing, it's usually a bad idea to use it, because you have no knowledge of what it's exactly doing. It'll work 90% of the time, but if you know what you're doing, you'll be able to get it right 100%.
Center-weighted average makes the scene come out to an average medium grey, but it weights the average to the center. Fast, but it lets you know what it's doing.
Spotmetering- you point the camera at a spot, and it tells you what exposure will make the tone of that specific spot come out medium grey. Simple, effective.
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