Nikon D300 User Manual (en)

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Aperture, Sensitivity, and Flash Range
The range of the built-in flash varies with sensitivity (ISO 
equivalency) and aperture.
The built-in flash has a minimum range of 0.6 m (2 ft.).
In programmed auto exposure mode (mode 
e), the maximum 
aperture (minimum f-number) is limited according to ISO 
sensitivity, as shown below:
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
1.0–12.0
3ft. 3in.–39ft. 4in.
2
2.8
4
5.6
8
0.7–8.5
2ft. 4in.–27ft. 11in.
2.8
4
5.6
8
11
0.6–6.1
2ft.–20ft.
4
5.6
8
11
16
0.6–4.2
2ft.–13ft. 9in.
5.6
8
11
16
22
0.6–3.0
2ft.–9ft. 10in.
8
11
16
22
32
0.6–2.1
2ft.–6ft.  11in.
11
16
22
32
0.6–1.5
2ft.–4ft. 11in.
16
22
32
0.6–1.1
2ft.–3ft. 7in.
22
32
0.6–0.8
2ft.–2ft. 7in.
Maximum aperture at ISO equivalent of:
200
400
800
1600
3200
3.5
4
5
5.6
7.1