I have no idea, but this is a guess. The T20 uses a low voltage between the
shoe and earth. Does the vivitar use a higher voltage? If the internal
contacts are a bit suss, the higher voltage may break over and make contact.
I also clutch at straws in my spare time.
Foxy
>
> Both work fine through either shoe on any other OM-1 body. What I can't
>understand is why only one would work with this particular body. If the
sync
>is working at all, it should fire either flash. But it only fires the old
>manual flash. Very strange.
>
>Jim
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