Most digital cameras has one or more pre-flashes so that a "normal" optical trigger for a remote flash will not work. (It triggers on the first pre-flash) Has anyone seen a fairly simple circuit for solving this problem. I have seen some that uses counters but that doesn't solve the problem as some cameras seems to not use the same # of pre-flashes every time. However the main flash seems to trigger at about the same time. Maybe a hold-off (non re-triggerable monostable F/F) and a gate circuit could work. Any ideas?
Rolf