Flash Photography
April 29, 2004
10-5
Flash Shooting Distance
Range for the Built-in
Speedlight
The flash shooting distance range varies, depending on ISO and aperture.
ISO
200
400
800 1600
Flash shooting
distance range (m)
Guide number
17
24
34
48
Aperture value
2
2.8
4
5.6
2 - 8.5
2.8
4
5.6
8
1.4 - 6
4
5.6
8
11
1 - 4.2
5.6
8
11
16
0.7 - 3
8
11
16
22
0.6 - 2.1
11
16
22
32
0.6 - 1.5
16
22
32
—
0.6 - 1.1
22
32
—
—
0.6 - 0.8
You can also calculate the maximum flash shooting distance by dividing
the guide number by the aperture value.
For example, with an aperture of f/2.8 and an ISO of 200, the maximum
flash shooting distance will be 17 / 2.8 = approximately 6 m.
