Nikon D3400 Reference Manual - English - Page 233

Image Dust Off Ref Photo G button ➜ B setup menu Acquire reference data for the Image Dust Off option in Capture NX-D (for more information, refer to Capture NX-D online help). Image Dust Off ref photo is available only when a type E or G 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. To exit without acquiring image dust off data, press G. The message shown at right will be displayed and "rEF" will appear in the viewfinder. 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; in manual focus mode, set focus to infinity manually. B The Setup Menu: Camera Setup 209