Yeah, I have my F3 in front of me and lxdude is correct.
As long as the back door is open and the camera is set to A, it should only fire at 1/80". When you close the back door, still in A, the camera will fire at 1/80" until you reach frame 1.
Oddly, in M mode, on frames 000, 00, and 0, the meter will remain inactive but you still have access to shutter speeds 8" through 1/80". This is a pain in the ass for those of us who like to start shooting from frame 00 or 0.
If the link above doesn't work, Google "Nikon F3 Manual" and you can download the official instruction manual which is still provided by Nikon USA.
Last edited by LJSLATER; 12-09-2012 at 03:47 AM. Click to view previous post history.