Front View
1. Focus Mode Selector switch
2. Lens Release button
3. 10-pin Remote socket (under rubber cap)
4. PC Sync socket (under rubber cap)
5. Self-Timer, Autofocus Assist, Red-eye Reduction lamp
6. Depth of Field Preview button
7. Fn (user-assignable Function) button
8. Primary Front Command dial (called sub-command
dial in Nikon manuals)
9. Shutter release
10. Vertical Shutter Release Lock lever
11. MB-D10 Mounting wheel
12. Lens Alignment mark
13. Lens strap attachment points
Thom Hogan's Complete Guide to the Nikon D300
V1.02
Page 225