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Anonymous
ok. here it is. the PC-sync cord on a flash can either be used to trigger other flashes or the flash itself. some reasons why you might use the PC sync cord on a flash are: using it off camera at a distance of over 17m from the camera, as TTL sync cords (1 in op's image) cannot work over this length because of signal degredation along the wire. other reasons why you would use it: as stated by someone above, you can use it to sync another slave without an optical trigger, or a set of studio strobes, ect. to explain to the person who was talking about the d80 commander mode, the flashes that you see fireing from the pop-up are the metering and control flashes. the camera first fires a samll pop from each group of strobes to determine the effect of the strobe on the exposure. it then sets teh power levels of the strobes by encoded infared light pulses. then it fires one more pulse to trigger the strobes at the set power level. the reason that the pop-up flash must be up is because while the strobes are controlled by an infared signal, the camera can only produce this signal by using the flash.
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