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I heard that when you use the sekonic meter to measure the flash output that is controlled by the ac3 that the meter triggers the speedlite at full power not the setting placed on the ac3. something about the channels being different on the ac3 and meter(mixed up on this) so your reading is not accurate. could someone clarify this?
also (different topic)using the tt5 and 580 ex ll remotelly with the mini and ac3 on camera, how do I use it in high sync? do I have to go the menu on my 5d mark lll and change to high sync in camera, and press high sync button on the speedlite, or do i just set the shutter to more then 1/250 sec in manual mode and shoot away. i want to use it for portraits with a sunny background. thanks very much, jim