Nikon D300 User Manual page 306

leave Shutter-release button AE-L
I might be holding the
track a moving subject through light and dark areas.
For sunset shooters (or something similar) who like to include
the sun in their image, this is a nice function. You can meter
from an area of the sky that has the best color and then swing
the camera around to include the sun in the shot. The camera
will expose for the originally metered area as long as you
hold the Shutter-release button
you'd just do this with the
Auto Meter-Off Delay
Custom setting C2 (D300S and D300)
(User's Manual – D300S page 273; D300 page 279)
Auto meter-off delay
camera's light meter stays on after you press the
Shutter-release button
value is 6 seconds.
When the light meter goes off, the various displays—like
shutter-speed and aperture—in the
Viewfinder do also.
If you would like your light meter to stay on longer for
whatever reason, such as for multiple-exposures, you can
adjust it to the following settings:
▪ 4s – 4 seconds
▪ 6s – 6 seconds (default)
turned on all the time since
Shutter-release button
halfway down. Normally,
AE-L/AF-L lock
controls the amount of time that your
halfway and then release it. The default
306
halfway down to
button.
Control panel and