That is generally an experience issue and since you have the D-SLR you may learn faster.
Try with your D-Slr in maual mode and your vivitar flash. Set the shutter at the same speed you would on your film-camera (1/60) and shoot pictures with direct flash, bouncing flash, diffused flash (you can use a piece of white paper around the hed), etc.
Then see how many stops you need to open to compensate.
I normally overexpose by 1 stop when using the flash bouncing from a card or when using a paper-diffuser. When you bounce it on the ceiling is a compeltely different thing, since height, color, etc change everything.
Over exposure is no problem with negative-film
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