Nikon D810 - Manual (Page 521)

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When used with the AF-S NIKKOR 14–24mm f/2.8G ED, the flash
will be unable to light the entire subject at all ranges.
The built-in flash can also be used with AI-S, AI-, AI-modified
NIKKOR, and Nikon Series E non-CPU lenses with a focal length
of 24–300mm. AI 50–300mm f/4.5, modified AI 50–300mm f/4.5,
and AI-S 50–300mm f/4.5 ED lenses must be used at a zoom
position of 180mm or above, and AI 50–300mm f/4.5 ED lenses
at a zoom position of 135mm or above.