239B The Setup Menu: Camera SetupAcquire reference data for the Image Dust Off option inCapture NX 2 (available separately; for more information, see theCapture NX 2 manual).Image Dust Off ref photo is available only when a CPU lens ismounted on the camera. A lens with a focal length of at least50 mm is recommended. When using a zoom lens, zoom all theway in.1 Choose a start option.Highlight one of thefollowing options and pressJ. To exit withoutacquiring image dust offdata, press G.• Start: The message shown at rightwill be displayed and “rEF” willappear in the viewfinder.• Clean sensor and then start: Select thisoption to clean the image sensorbefore starting. The message shownat right will be displayed and “rEF”will appear in the viewfinder whencleaning is complete.Image Dust Off Ref PhotoG button ➜ B setup menuD Image Sensor CleaningImage Dust Off reference data recorded before image sensorcleaning is performed can not be used with photographs takenafter image sensor cleaning is performed. Select Clean sensor andthen start only if the Image Dust Off reference data will not beused with existing photographs.