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... , as a wireless E-TTL ... P.Fn 02 applies to what the illumination color is for ordinary flash photography, as a way to quickly visually distinguish a flash pre-set for general shooting, vs . one pre-set to be used as an off-camera receiver flash. ... P.Fn 04 — AF- assist beam method ... This Personal Function controls which type of focus- assist beam will be used, when it’s mounted directly on an EOS camera, and One-Shot AF is active on the camera.
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