Nikon D300 User Manual page 712

Setting Your Lens to Manual
Focus
If you'd like, you can use the A-M switch found on most AF
Nikkors to set the lens to Manual focus and override the AF
system completely. If the AF Nikkor lens supports autofocus
with manual priority (M/A), you can use the AF Module to
obtain primary focus and then fine-tune it manually.
Tied in closely with the AF system is the Release mode. This
determines how the camera takes the picture: one at a time or
in continuous bursts. You can look through the Viewfinder to
compose or use Live View mode (Lv), which allows you to
use the Monitor on the back of the D300(S) instead of the
Viewfinder to compose the image.
The AF Module supports 10 Custom settings, a1-a10. We've
examined each of those Custom settings in the chapter titled
Chapter 4. Also, see the chapter called Chapter 3 for more
information on how to use the Shooting menu banks. Let's
consider the various features of the Multi-CAM 3500DX AF
Module in detail.
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