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Flash-to-subject distance
ISO Film Wide Tele
Speed (24 mm) (60 mm)
50 2 to 10 ft 2 to 7 ft
(0.6 to 3.0 m) (0.6 to 2.1 m)
100 2 to 14 ft 2 to 10 ft
(0.6 to 4.3 m) (0.6 to 3.0 m)
200 2 to 20 ft 2 to 14 ft
(0.6 to 6.1 m) (0.6 to 4.3 m)
400 2 to 29 ft 2 to 20 ft
(0.6 to 8.8 m) (0.6 to 6.1 m)
800 2 to 41 ft 2 to 28 ft
(0.6 to 12.5 m) (0.6 to 8.5 m)
1600 2 to 57 ft 2 to 39 ft
(0.6 to 17.4 m) (0.6 to 11.9 m)
Flash/warning-lamp signals
Lamp Indicator Situation
Glows green • Camera ready for
picture-taking
Glows red • Subject between
8 in. (20 cm) and
2 ft (0.6 m) from
camera. Shutter
button locks.
“Blinks” red • Flash not
fully charged
• Camera movement
• Beyond the
flash range