92
More on Photography
A
Aperture, Sensitivity, and Flash Range
Flash range varies with sensitivity (ISO equivalency) and aperture.
Aperture at ISO equivalent of
Approximate range
100
200
400
800 1600 3200 6400
m
ft
1.4
2
2.8
4
5.6
8
11
1.0–6.0
3ft 4in.–19ft 8in.
2
2.8
4
5.6
8
11
—
0.7–4.2
2ft 4in.–13ft 9in.
2.8
4
5.6
8
11
—
—
0.6–3.0
2ft–9ft 10in.
4
5.6
8
11
—
—
—
0.6–2.1
2ft–6ft 10in.
5.6
8
11
—
—
—
—
0.6–1.5
2ft–4ft 11in.
8
11
—
—
—
—
—
0.6–1.1
2ft–3ft 7in.
11
—
—
—
—
—
—
0.6–0.7
2ft–2ft 4in.