1

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?

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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