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Nikon SB800/900 real GN value ...

Started Apr 2, 2014 | Discussions thread
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snellius
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Re: Nikon SB800/900 real GN value ...
In reply to Arnaud M, Apr 4, 2014

How did you measure the distance? At 1 meter from the front of the flash, or the shooting distance of 1 m (distance to the film or sensor). At 1 meter, this can be a big difference. At 5 meters it does not matter anymore. The guide number is also based on an average amount of reflection.

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