Nikon D750 User Manual page 215

Aperture, Sensitivity, and Flash Range
A
Flash range varies with sensitivity (ISO equivalency) and aperture.
Aperture at ISO equivalent of
100 200 400 800 1600 3200 6400 12800
1.4 2 2.8 4 5.6
2 2.8 4 5.6 8
2.8 4 5.6 8 11
4 5.6 8 11 16
5.6 8 11 16 22
8 11 16 22 32
11 16 22 32 —
16 22 32 — —
The built-in flash has a minimum range of 0.6 m (2 ft).
In mode P, the maximum aperture (minimum f-number) is limited
according to ISO sensitivity, as shown below:
Maximum aperture at ISO equivalent of:
100 200 400
2.8 3.5 4
If the maximum aperture of the lens is smaller than given above, the
maximum value for aperture will be the maximum aperture of the lens.
See Also
A
See page 190 for information on locking flash value (FV) for a metered
subject before recomposing a photograph.
For information on auto FP high-speed sync and choosing a flash sync
speed, see Custom Setting e1 (Flash sync speed, 0 345). For
information on choosing the slowest shutter speed available when
using the flash, see Custom Setting e2 (Flash shutter speed, 0 346).
For information on flash control and using the built-in flash in
commander mode, see Custom Setting e3 (Flash cntrl for built-in
flash, 0 347).
See page 433 for information on using optional flash units.
Range
m
8 11 16 0.7–8.5 2ft 4in.–27ft 10in.
11 16 22 0.6–6.0 2ft–19ft 8in.
16 22 32 0.6–4.2 2ft–13ft 9in.
22 32 — 0.6–3.0 2ft–9ft 10in.
32 — — 0.6–2.1 2ft–6ft 10in.
— — — 0.6–1.5 2ft–4ft 11in.
— — — 0.6–1.1 2ft–3ft 7in.
— — — 0.6–0.8 2ft–2ft 7in.
800 1600 3200 6400
5 5.6 7.1 8
ft
12800
10
187