----- Original Message ----- From: "Don Williams"
Subject: Flash problems
Last week, or maybe the week before, I posted about the flash I'm using with the *ist D on the microscope. The voltage on the trigger when the unit is fully charged is 6.5V and the centre wire is positive. Is this the right way round? The flash still only fires once -- unless disconnected between each picture. But there's another problem. With ISO 200 film, on the Wild MPS camera, the exposures are good. But all the digital pictures are dreadfully underexposed at 200. Is there an explanation for this -- I can't think of an obvious one. The optical setup is the same as before.
I don't know if the wiring is the right way arund or not. If you can reverse the polarity though, it's certainly something to try. As for the underexposure, I don't have a clue, other than to check the usual suspects, such as shutter speed out of range.
William Robb
