Nikon SB800/900 real GN value ...

Started Apr 2, 2014 | Discussions thread
michaeladawson Forum Pro • Posts: 11,559
Re: Nikon SB800/900 real GN value ...

Arnaud M wrote:

Does someone has made real power measurements with a flash meter of the Nikon Speedlight SB900 and SB800 ?

I have been testing my side last night with a Sekonic 308s which seems to confirm my observations in the field.

I find a guide number of 22.9 at full power flashes wathever the model powered by 4 x 1.5V alcalynes batteries or 4 x 1.2V Eneloop batteries.
Flash set to manual at full power, FX format on SB900, 35mm manual focal length, flash meter to 1 meter in line with the flash in a dark room with little stray reflections, ISO 100.

Feeding the SB800 with 5 alcalynes 1.5V batteries, the guide number changes to 32.1

There should be no increase in GN due to putting in an extra battery.  The power to the flash is provided by the capacitor.  A 5th battery should only serve to recharge the capacitor faster and to provide more total flashes off a set of batteries.

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Mike Dawson

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