Nikon SB800/900 real GN value ...

Started Apr 2, 2014 | Discussions thread
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Arnaud M
Arnaud M OP Contributing Member • Posts: 542
Re: Nikon SB800/900 real GN value ...

snellius wrote:

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.

The flashmeter is set at one meter from the front of the flash. The flash doen't have any diffuser on it, but the flashmeter as the dome diffuser in place because it's a incident light measurement.

So, at 1m and 100 iso, you should read directly the guide number. In my case : 22.9

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