Nikon D300 D300 User's 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 welllit, featureless white object, frame the object so that it fills the viewfinder and then press the shutter-release button halfway. U In autofocus mode, focus will automatically be set to infinity; in manual focus mode, set focus to infinity manually. 319