Nikon D300 User Manual page 271

3. Choose one of the two choices from the menu. In
Figure 4-10, image 3,
4. Press the
Here's a description of the two selections:
▪ Shutter / AF-ON – Autofocus will be activated if you
press the
the AF-ON
▪ AF-ON Only – Autofocus only works when you press
the AF-ON
activate autofocus; it will only start metering and release
the shutter. There are two distinct needs addressed with
this
function. A few people need to separate autofocus and
shutter release. Most don't. If you prefer to autofocus
only with the
function. Otherwise, you'll autofocus by pressing the
Shutter-release button
Shutter/AF-ON
button.
My Recommendation: I use
I'm primarily a nature shooter and don't need to separate
autofocus from shutter release. I don't have many fast moving
subjects, other than flying birds or leaping deer. And with
those, it just feels more natural to me to autofocus and fire the
shutter with one button.
However, if I were shooting a high-speed event and wanted to
maximize my camera's firing speed (frame rate), I wouldn't
hesitate to use
setting a1-AF-C priority selection
Shutter/AF-ON
OK button to lock in the setting.
Shutter-release button
button.
button. The
AF-ON
selected, you can autofocus with either
AF-ON only, and I would change
halfway or if you press
Shutter-release button
button, you can set it with this
halfway down. If you have
Shutter/AF-ON
to Release
271
has been selected.
will not
myself since
Custom
priority. That