Watching Over

by Vian Esterhuizen

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Optical slave flashes are somewhat finicky because most cameras with a builtin flash have one or more pre-flashes, for red-eye reduction as well as to help with focusing and exposure metering (e.g. Canon's E-TTL). A simple optical slave will trigger on those and then be unavailable for the main flash. There are two way to tackle this problem: Turn off the ...



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