Nikon D810 - Manual (Page 457)

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Notes on Optional Flash Units
Refer to the flash unit manual for detailed instructions. If the unit
supports CLS, refer to the section on CLS-compatible digital SLR
cameras. The D810 is not included in the “digital SLR” category in the
SB-80DX, SB-28DX, and SB-50DX manuals.
i-TTL flash control can be used at ISO sensitivities between 64 and
12800. At high ISO sensitivities, noise (lines) may appear in photos
taken with some optional flash units; if this occurs, choose a lower
value. At values under 64 or over 12800, the desired results may not be
achieved at some ranges or aperture settings. If the flash-ready
indicator flashes for about three seconds after a photograph is taken in
i-TTL or non-TTL auto mode, the flash has fired at full power and the
photograph may be underexposed (CLS-compatible flash units only;
for information on the exposure and flash charge indicators on other
units, see the manual provided with the flash).
When an SC-series 17, 28, or 29 sync cable is used for off-camera flash
photography, correct exposure may not be achieved in i-TTL mode.
We recommend that you select standard i-TTL flash control. Take a test
shot and view the results in the monitor.
In i-TTL, use the flash panel or bounce adapter provided with the flash
unit. Do not use other panels such as diffusion panels, as this may
produce incorrect exposure.