Nikon D750 DSLR Camera (Body Only) - Manual (Page 466)

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Notes on Optional Flash Units
Refer to the flash unit manual for detailed instructions. If the flash unit
supports CLS, refer to the section on CLS-compatible digital SLR
cameras. The D750 is not included in the “digital SLR” category in the
SB-80DX, SB-28DX, and SB-50DX manuals.
If an optional flash unit is attached in shooting modes other than j , % ,
and u , the flash will fire with every shot, even in modes in which the
built-in flash can not be used.
i-TTL flash control can be used at ISO sensitivities between 100 and
12800. At values under 100 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.