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Author Message   Aphototaker Tinkerer Username: Aphototaker Post Number: 150 Registered: 12-2009 Rating: N/A Votes: 0 Posted on Wednesday, March 10, 2010 - 09:50 pm:    I just now checked the Vivitar 283 flash on my A-1. This camera has a wire (black) going from someplace in the body to the center contact of the PC sync socket, and from there to the hot shoe (I presume to the center contact). The flash works at both place, at the PC socket and on the hot shoe. Max sync speed of 1/60 sec. The PC socket gives continuity as long as the shutter is open (in contrast to the AE-1P I checked earlier). I was not able to see any continuity at the hot shoe though (same as in AE-1P). hmmm ... the premise that the flash is triggered just by making of a metal contact at the hot shoe older film cameras doesn't seem to be right in these case. Can the tinker gurus familiar with these cameras clear my doubts?