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I am using an R7 camera and 600EX-RT flashes at a few indoor occasions. Exposure is very inconsistent, where one shot will be perfect, then a few minutes later, shots will look like the flash had little to no effect, even though it went off.  This ha...
I have tried several times to use my R7 with two or three 600EX-RT flashes.  One flash on camera works fine.  A second or third as slaves always results in an under-exposed image, as if the on-camera flash is cutting power if it "sees" the other flas...