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Flash-to-subject distance
ISO Film Wide Tele
Speed (25 mm) (50 mm)
50 2 to 11 ft 2 to 6 ft
(0.6 to 3.4 m) (0.6 to 1.8 m)
100 2 to 15 ft 2 to 8 ft
(0.6 to 4.6 m) (0.6 to 2.4 m)
200 2 to 21 ft 2 to 11 ft
(0.6 to 6.4 m) (0.6 to 3.4 m)
400 2 to 30 ft 2 to 16 ft
(0.6 to 9.1 m) (0.6 to 4.9 m)
800 2 to 42 ft 2 to 22 ft
(0.6 to 12.8 m) (0.6 to 6.7 m)
1600 2 to 59 ft 2 to 31 ft
(0.6 to 18 m) (0.6 to 9.4 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 shake
warning
• Beyond the
flash range