Nikon SB800/900 real GN value ...

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Arnaud M
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Nikon SB800/900 real GN value ...
3 months ago

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
France
http://arnaudmarie.zenfolio.com

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