aim54x wrote:nice work john! Do you still have the setup for that?
No, but it's super easy to make, and cost about $10 from jaycar.
Just a piezoelectric diaphragm, a BD139(from memory) and some wire to a sync plug.
the diaphragm was taped to a piece of aluminium about a foot to the right of the frame, and the little voltage created when the pellet hit the aluminium was enough to trigger the bd139 and in turn the flash.
timing is simple, just move the aluminium plate back and fourth.
the other trick is to set your flash on a very low power, like 1/32 or so, to get the quickest flash out of it.