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> > Also, if P-TTL is available on the external flash, it will be used over TTL.
True, but . . .
Sorry Mo, but it might be useful to mention here that if the flash supports both P-TTL and TTL (like the Sigma EF 500 DG Super) then one can force the flash into TTL by moving the aperture ring on the lens (as long as it has one) away from "A" and setting the f-stop manually. Then the camera/flash system will revert to TTL.
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