Nikon D300 User Manual page 345

1
Choose a start option.
Highlight one of the following
options and press J. To exit
without acquiring image dust
off data, press G.
• [Start]: The message shown at right will
be displayed and "rEF" will appear in
the viewfinder and control panel
displays.
• [Clean sensor and then start]: Select this
option to clean the image sensor
before starting. The message shown at
right will be displayed and "rEF" will
appear in the viewfinder and control
panel displays when cleaning is
complete.
D
Image Sensor Cleaning
Dust off reference data recorded before image sensor cleaning is
performed can not be used with photographs taken after image
sensor cleaning is performed. Select [Clean image sensor and then
start] only if the dust off reference data will not be used with existing
photographs.
2
Frame a featureless white object in the viewfinder.
With the lens about ten centimeters (four inches) from a well-
lit, featureless white object, frame the object so that it fills the
viewfinder and then press the shutter-release button halfway.
In autofocus mode, focus will automatically be set to infinity;
in manual focus mode, set focus to infinity manually.
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