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D. Diggler wrote:
Metering on the camera would be Matrix. The camera is under full manual exposure, though.
Yes, but the flash has to be metered, too.
Inconsistent results are from the beginning.
Ok, so it has nothing to do with the flash reducing power because of overheating
Various lenses ... Tamron, Tokina, Sigma, Nikon AF-S.
Don´t know about the third party lenses, but at least the AF-S lens tells the camera the focus distance.
One thing he could try: Next wedding, shoot in centerweighted metering. The results might be off, but at least they would be constant.
Matrix metering has changed with the newer cameras (like d800, don´t know about the 7100, though): the part of the image with the active af area gets much more important for the exposure calculation