Nikon F4 User Manual
Page 176
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Flash ready-light Viewfinder LED lights up when Nikon
dedicated speedlight is ready to fire;
blinks to warn of poor camera/
speedlight connection or insufficient
light for correct exposure
Autofocus flash
Possible with Nikon Autofocus
photography
Speedlights SB-24, SB-23, SB-22 or
SB-20
Power source
Nikon High Speed Battery Pack
MB-21 (six AA-type alkaline-manga
nese or NiCd batteries). Battery
Pack MB-20 (four /AA-type alkaline-
manganese batteries), External
Power Regulator MB-22
Number of 36-exposure film rolls per set of fresh
batteries
Batteries
At 20°C
(68°R
At-IO^F)
(14»F)
High Speed Bat-
tery Pack MB-21
Alkaline-manganese (LR6) approx. 90 approx. 15
NiCd batteries (NiCd)
approx. 70 approx. 35
Battery Pack
MB-20
Alkaline-manganese (LR6) approx. 30 approx. 5
'For Continuous Servo Autofocus with AF Zoom-Nikkor 35-70mm
f/3.3-f/4.5 iens, film advance mode selector at C
h
and a shutter speed
of 1/250 sec. or faster.