So I've already done some homework on flashes, the 430ex430EX and the 580ex580EX but a couple of things are unclear to me...
canCan the 430ex iii430EX III-rtRT be used WITHOUTwithout also firing the built-in flash on my t6iT6i? Or does my built-in flash HAVEalso have to fire also.? I know it at least has to be up, but is there a setting where I can at least have it up but not firing? I don't want the light from the built-in flash to interfere with my external...