Nikon F4 User Manual
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•The usable film speed for TTL flash photography is ISO
25-1000; for non-TTL flash photography, it is 6-6400.
• For details on speedlight operation, see the speedlight
• Use Nikon Speedlights. Other units may damage the
camera's electrical circuit due to incompatible voltage
requirements, electric contact alignment or switch
•When using a special speedlight with a time-lag provi
sion or when using a speedlight with a long flash du
ration (i.e., Medical-Nikkor 120mm f/4), adjust shutter
speed down to 1/125 sec. or slower.
•When using a speedlight that does not allow automatic
sync speed setting, set the camera’s exposure mode