1

This question already has an answer here:

I have a new Nikon D850, and I'm using the Nikon SB-910 flash. When I take a shot, the flash pops 3 short flashes. Then the shutter engages, and the full flash goes off. The batteries are OK.

Does anybody have any ideas what the issue could be?

marked as duplicate by Michael C, scottbb, xiota, Hueco, mattdm Sep 13 at 17:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

4

Sounds like you have Red-eye reduction switched on.

From the linked online manual…

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The characteristic of red-eye reduction is to pre-flash, one or more times, so your subject's pupils contract, preventing reflection of the flash from the rear of the eyeball.

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