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Flash
Flash Shooting Distance Range
The distance ranges for flash at various combinations of aperture and ISO are shown in the
table below:
ISO 100 200 400
Flash shooting
distance range (m/ft)
Guide number (m/ft) 14/45.9 20/6.5 28/91.9
Aperture
1.4 2 2.8 2.0 - 9.9/6.6 - 32.5
2 2.8 4 1.4 - 7.0/4.6 - 23
2.8 4 5.6 1.0 - 5.0/3.3 - 16.4
4 5.6 8 0.7 - 3.5/2.3 - 11.5
5.6 8 11 0.6 - 2.5/2.0 - 8.2
8 11 16 0.6 - 1.8/2.0 - 5.9
11 16 22 0.6 - 1.3/2.0 - 4.3
16 22 32 0.6 - 0.9/2.0 - 3.0