Nikon F3 User Manual
Page 32
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Frame counter i
To keep track of the number of exposed frames, the frame 
counter is graduated from two frames below 0 up to 40. 
Blue numerals appear every 5 frames (0, 5, 10, etc.) with 
dots in between. White marks at 12, 20, 24, and 36 indi
cate the number of frames available on most film car
tridges. When making blank shots with the shutter speed
dial set to "A," the shutter will fire at 1/80 sec. until the 
frame counter reaches "1." In addition, the LCD shows 
80 in the finder. Or if you set the dial manually between
1/125 and 1/2000 sec., the shutter will still fire at 1/80 sec.
In the finder, an “M80" is displayed. However, if the 
speed is manually set to 1/80 sec. (X) or below, the shutter 
will fire at the speed set and the speed will be displayed 
by the LCD. Therefore, to speed up film loading, set the 
dial to "A" or to 1/80 sec. (X) or above. "T" should not be
used when making blank shots as the shutter will remain 
locked open.
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