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Effective flash range
Film speed
Wide angle (38 mm)
Telephoto (120 mm)
ISO 100
0.9 – 2.8 m
0.9 – 2.0 m
3.0 – 9.2 ft.
3.0 – 6.6 ft.
ISO 400
0.9 – 5.6 m
0.9 – 4.0 m
3.0 – 18.4 ft.
3.0 – 13.1 ft.
ISO 800
0.9 – 7.9 m
0.9 – 5.6 m
3.0 – 25.9 ft.
3.0 – 18.4 ft.
ISO 1600
0.9 – 11.2 m
0.9 – 8.0 m
3.0 – 36.7 ft.
3.0 – 26.2 ft.
(Using color negative film)
Under low light when flash must be used, the following chart gives you the effective flash range for correct exposures for films
of various speeds. Note that high-speed film (ISO 400/800) extends your flash range significantly.
Effective flash range
Film speed
Wide angle (38 mm)
Telephoto (105 mm)
ISO 100
0.9 – 2.8 m
0.9 – 2.2 m
3.0 – 9.2 ft.
3.0 – 7.2 ft.
ISO 400
0.9 – 5.6 m
0.9 – 4.4 m
3.0 – 18.4 ft.
3.0 – 14.4 ft.
ISO 800
0.9 – 7.9 m
0.9 – 6.2 m
3.0 – 25.9 ft.
3.0 – 20.3 ft.
ISO 1600
0.9 – 11.2 m
0.9 – 8.8 m
3.0 – 36.7 ft.
3.0 – 28.9 ft.
(Using color negative film)
