Nikon D300 User Manual page 410

Shooting
Problem
Camera takes time to turn
on.
Shutter-release disabled.
Photos are out of focus.
Full range of shutter
speeds not available.
Focus does not lock when
shutter-release button is
n
pressed halfway.
384
Solution
Delete files or folders.
• Memory card is full or not
inserted.
• CPU lens with aperture ring
attached but aperture not locked
at highest f-number. If
displayed in control panel, select
[Aperture ring] for Custom
Setting f7 ([Customize command
dials]) > [Aperture setting] to use
lens aperture ring to adjust
aperture.
• Exposure mode S selected with
A selected for shutter speed.
• Rotate focus-mode selector to S
or C.
• Camera unable to focus using
autofocus: use manual focus or
focus lock.
Flash in use. Flash sync speed can
be selected using Custom Setting
e1 ([Flash sync speed]); when using
optional SB-900, SB-800, SB-600, or
SB-R200 Speedlight, choose
[1/320 s (Auto FP)] or [1/250 s (Auto
FP)] for full range of shutter speeds.
Camera is in focus mode C: use AE-L/
AF-L button to lock focus.
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