Nikon D3 - Manual (Page 147)

121
Z
Shutter speed can be locked at the selected setting (see page
127).
3
Frame a photograph, focus, and shoot.
A
See Also
See page 411 for information on what to do if flashing “A” indicator
appears in the shutter-speed displays.
Slow shutter speed ( 1 /
10
s) Fast shutter speed ( 1 /
1,000
s)