Nikon 25434 D3 User's Manual - Page 377
Dust off Ref Photo, Select [Start]., Frame a featureless white object in the viewfinder.
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Dust off Ref Photo Acquire reference data for the Image Dust Off option in Capture NX (available separately; for more information, see the Capture NX manual). [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 Select [Start]. Highlight [Start] and press J. The message shown at right will be displayed and "rEF" will appear in the viewfinder and control panel displays. To exit without acquiring image dust off data, press G. 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. In autofocus mode, focus will automatically be set to infinity; U in manual focus mode, set focus to infinity manually. 351