At 3:32 AM +0100 1/3/05, Listar wrote:
>Date: Sun, 02 Jan 2005 15:26:15 -0500
>From: Ali Shah <farali@xxxxxxxxxxxx>
>Subject: [OM] Re: Vivitar 550FD M/P/O discussion
>
>I have a brand new VIVITAR 550FD (never used still in box). What is the
>thought of using this with OM bodies?
Borrow a digital voltmeter and measure the voltage between the main
synch contact pin and the ground plate (in the groove where the hot
shoe slides in. The main pin is the large one that causes the flash
to go off if you short it to the ground plate using a piece of wire.
If the voltage is less than twenty volts, and the same polarity as OM
flashes, you're OK on all OM bodies. If the voltage is more than
twenty volts (a hundred or more being typical), the flash can be used
only on the OM-1 for sure. I don't know about the OM-2, but the OM-3
and OM-4 are out.
I measure 11.3 volts on a T Power Control, with the trigger contact
positive and the shoe negative.
Joe
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