Nikon D300 User Manual (en)

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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.