Nikon SB800/900 real GN value ...

Started 4 months ago | Discussions thread
snellius
Regular MemberPosts: 320
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Re: Nikon SB800/900 real GN value ...
In reply to Arnaud M, 4 months ago

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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