The flash includes a voltage source. The
shutter contains a dry contact. So you should be able to test your flash using
any kind of electrical contact – a wire, a bent paper clip, etc.
From: owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Tim Holmes
Sent: Thursday, May 11, 2006 9:15
AM
To: List for Photo/Imaging
Educators - Professionals - Students
Subject: What triggers an off
camera flash?
Hi folks:
I suspect that this is a really dumb question, but I have been fighting this
battle for several months now, and I still am having troubles. I have a
Sunpack 555 thyristor handle flash that I am trying to use with my D70.
It fires very intermittantly. I am beginning to suspect cable or contact
problems (its an older flash). I am wondering, what is sent over the
cable to the hotshoe of a flash when it fires? If it is a voltage, i can
take a source and re-create it so i can test the contacts etc, if it simply
closes a circuit, i can also repliacte that -- the short answer is -- I dont
know what causes the flash to fire, so i cant re-create it in a controlled
environment to begin to test failure modes. Can any one help
Right now - im using the D70, The nikon hotshoe adapter, and sunpack cables to
the flash -- sometimes it works great -- others -- not so well
Any help is appreciated.
TIM
