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Vivitar 40D flash question
Anybody know what the GN is on this flash?
Thanks. Mike |
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Vivitar 40D flash question
"Michael Marcelletti" wrote in message m... Anybody know what the GN is on this flash? Thanks. Mike Usually expressed as feet @ ISO 100. From the chart on the flash, take the ISO 100 distance for f/4 (ft or m) and multiply by 4, or the f/2 distance and multiply by 2. GN / f = distance to subject. |
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