Nikon SB800/900 real GN value ...

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

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

We are far from the values ​​announced by Nikon SB900 (GN 34 @ 35mm FX).

Is this due to the aging of the flash tube or can you confirm these values ​​?

Thank you for your contribution.

Arnaud Marie

 Arnaud M's gear list:Arnaud M's gear list
Nikon D750 Nikon 35mm F1.8G ED Nikon 200-500mm F5.6E ED VR Nikon AF-S Nikkor 70-200mm f/2.8G ED VR Tamron SP AF 90mm F/2.8 Di Macro +3 more
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