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Through-the-lens metering (TTL) is a feature in many modern cameras that allows the user to measure light levels through the lens that will capture the picture.

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Why do I have to set my flash to -3ev flash exposure compensation?

I have a Canon 70d and I use the 622c wireless trigger/remote with the YN 565 EX flashes. When setting them on E-TTL, all my shots are overexposed. I've checked the camera and the flashes and all the ...