Nikon D750 User Manual page 215

A
Aperture, Sensitivity, and Flash Range
Flash range varies with sensitivity (ISO equivalency) and aperture.
Aperture at ISO equivalent of
100 200 400
1.4 2 2.8
2 2.8 4
2.8 4 5.6
4 5.6 8
5.6 8 11
8 11 16
11 16 22
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:
100 200
2.8 3.5
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.
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See Also
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.
800 1600 3200 6400 12800
4 5.6 8
5.6 8 11
8 11 16
11 16 22
16 22 32
22 32 —
32 — —
— — —
Maximum aperture at ISO equivalent of:
400 800
4 5
m
11 16 0.7–8.5 2ft 4in.–27ft 10in.
16 22 0.6–6.0
22 32 0.6–4.2
32 — 0.6–3.0
— — 0.6–2.1
— — 0.6–1.5
— — 0.6–1.1
— — 0.6–0.8
1600 3200
5.6 7.1
Range
ft
2ft–19ft 8in.
2ft–13ft 9in.
2ft–9ft 10in.
2ft–6ft 10in.
2ft–4ft 11in.
2ft–3ft 7in.
2ft–2ft 7in.
6400 12800
8 10
187