Aperture, sensitivity, and flash range – Nikon D90 User Manual
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Aperture, Sensitivity, and Flash Range
Flash range varies with sensitivity (ISO equivalency) and aperture.
In the following modes, the maximum aperture (minimum f-number) is limited
according to ISO sensitivity when the built-in flash is used:
For each one-step increase in sensitivity (e.g., from 200 to 400), aperture is stopped
down by half an f/-stop. 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.
Aperture at ISO equivalent of
Range
200
400
800
1600
3200
m
ft.
1.4
2
2.8
4
5.6
1.0–8.5
3ft. 3in.–27ft. 11in.
2
2.8
4
5.6
8
0.7–6.1
2ft. 4in.–20ft.
2.8
4
5.6
8
11
0.6–4.2
2ft.–13ft. 9in.
4
5.6
8
11
16
0.6–3.0
2ft.–9ft. 10in.
5.6
8
11
16
22
0.6–2.1
2ft.–6ft. 11in.
8
11
16
22
32
0.6–1.5
2ft.–4ft. 11in.
11
16
22
32
—
0.6–1.1
2ft.–3ft. 7in.
16
22
32
—
—
0.6–0.8
2ft.–2ft. 7in.
Mode
Maximum aperture at ISO sensitivity of
200
400
800
1600
3200
P
,
i, k, o
2.8
3.3
4
4.8
5.6
n
5.6
6.7
8
9.5
11