V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 544
allows up to about a half stop of error, so it is entirely
possible that your camera is calibrated incorrectly. If so,
this is the function to use to fix that.
Custom Setting #C1 Shutter Release Exposure Locking
(Shutter-release button AE-L)
Many consumer cameras automatically lock the exposure
when the shutter release is pressed partway, but the D300
(and most other Nikon DSLRs) behave differently:
On
Exposure locks when
either
the shutter
release is held partway down or the
AE-L/AF-L
button is pressed.
Off
Exposure locks only when the
AE-
L/AF-L
button is pressed [default]
Recommendations:
1. If you’re used to having exposure lock when you press the
shutter release partway—the behavior of most consumer
cameras—then consider setting this option to a value of
On
. Note that if you like to set exposure and then pan
over to your final composition, you need to either set this
option or get in the habit of using the
AE-L/AF-L
button.
2. A little known fact about the
AE-L/AF-L
button is that it
doesn’t actually lock the aperture and shutter speed: it
locks the overall exposure. In the automated exposure
modes you can actually hold the button in and then use
the Front and/or Rear Command dials (depending upon