299Menu Guide > B The Setup MenuAcquire reference data for the Image Dust Off option inCapture NX-D (for more information, refer to Capture NX-Donline help). Image Dust Off cannot be used with small ormedium-sized NEF (RAW) images.An FX lens with a focal length of at least 50 mm is recommendedwhen recording Image Dust Off reference data. When using azoom lens, zoom all the way in.1 Choose a start option.Highlight one of the following optionsand press J. To exit without acquiringimage dust off data, press G.• Start: A message will be displayed.• Clean sensor and then start: Select thisoption to clean the image sensorbefore starting. A message will bedisplayed when cleaning iscomplete.2 Frame a featureless white object in the display.With the lens about ten centimeters (four inches) from a well-lit, featureless white object, frame the object so that it fills thedisplay 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.Image Dust Off Ref PhotoG button ➜ B (setup menu)
