Marcus,
If the slides from your OM-2S are spot on when you set the film speed 2/3
stop higher I would be inclined to set the film speed as rated - print film
does better with a liitle overexposure than with underexposure.
With a Viv 283 you unfortunately can't do OTF flash. I would leave the camera
on manual, set shutter speed to 1/60, and select an aperture as recommended
by the calculator panel on the Vivitar. By using the auto mode on the Viv the
film speed you set on the OM-2S won't affect exposure.
Hope this helps,
Paul Schings
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