Nikon D90 D90 User's Manual - Page 226

Image Dust off Ref Photo Acquire reference data for the Image Dust Off option in Capture NX 2 (available separately; for more information, see the Capture NX 2 manual). Image dust off ref photo is available only when a CPU lens is mounted on the camera. A lens with a focal length of at least 50 mm is recommended. When using a zoom lens, zoom all the way in. 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. DImage 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 sensor and then start only if the dust off reference data will not be used with existing photographs. 2 g 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. 206