Nikon D300 User Manual page 223

Figure 3-54. Identifying the Live view modes
Now, let's briefly discuss how each of these modes work.
▪ Hand-held – This mode uses the same phase-detection
autofocus system as when you are looking through the
Viewfinder. When you take a picture in this mode, it
works pretty fast since it focuses using the normal reflex
mirror and autofocus system. The drawback for having a
fast mode is that the Monitor must black out briefly, just
as when you're using the Viewfinder.
Taking a picture in Hand-held mode happens in two
steps. When you press the Shutter-release button, you'll
first hear a slap as the mirror raises, and then the screen
will black out as autofocus works. Then you'll hear the
mirror move up and down once more as the image is
taken, and the view will reappear. It's a bit strange to use
the first couple of times, and it makes a lot of noise, but
this mode works pretty well.
You can use either the Shutter-release button or the
AF-ON button to autofocus the camera when using
Hand-held mode. Oh, and don't be afraid to use
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