Nikon D100 Manual page 112

Flash Photography
Flash Range, Aperture, and Sensitivity
Flash range varies with sensitivity (ISO equivalency) and aperture.
Aperture at an ISO equivalent of
200 250 320 400 500 640 800 1000 1250 1600
2 2.2 2.5
2.8 3.2 3.5
4 4.5 5
5.6 6.3 7.1
8 9 10
11 13 14
16 18 20
22 25 29
The minimum range at which the built-in Speedlight will be able to light the entire
subject is 0.6 m (2´).
In auto multi program, the maximum aperture (minimum f/-number) is limited accord-
ing to sensitivity (ISO equivalency), as shown below:
200 250
3.3 3.5
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.
D-TTL flash control can be used to adjust flash output at sensitivity (ISO equivalency)
settings between 200 and 1600. At settings of HI-1 and HI-2, the desired results may
not be achieved at some ranges or aperture settings.
Using the Built-in Speedlight
If the built-in Speedlight is raised in continuous shooting mode, only one photograph
will be taken each time the shutter-release button is pressed.
Vibration reduction (available with VR lenses) will not take effect if the shutter-release
button is press halfway while the built-in Speedlight is charging.
100
2.8 3.2 3.5
4 4.5 5
5.6 6.3 7.1
8 9 10
11 13 14
16 18 20
22 25.4 29
32 — —
Maximum aperture at an ISO equivalent of
320 400 500
3.8 4 4.2
4 4.5 5 5.6
5.6 6.3 7.1
8 9 10
11 13 14
16 18 20
22 25 29
32 — —
— — —
640 800
4.5 4.8
Range
m
2–8.5 6´7˝–27´11˝
8 1.4–6 4´7˝–19´8˝
11 1–4.2 3´3˝–13´9˝
16 0.7–3 2´4˝–9´10˝
22 0.6–2.1 2´–6´11˝
32 0.6–1.5 2´–4´11˝
— 0.6–1.1 2´–3´7˝
— 0.6–0.8 2´–2´7˝
1000 1250
5 5.3
ft
1600
5.6