339Whenever you set the power switch to <1> or <2>, the SelfCleaning Sensor Unit is activated to automatically shake off any dust onthe front of the sensor. Normally, you need not pay attention to thisoperation. However, you can manually perform sensor cleaning or candisable this unit as follows.1 Select [Sensor cleaning]. Under the [54] tab, select [Sensorcleaning], then press <0>.2 Select [Clean nowf]. Select [Clean nowf], then press<0>. Select [OK], then press <0>. The screen will indicate that the sensoris being cleaned. (A small sound maybe heard.) Although there will be amechanical sound of the shutter duringthe cleaning, no picture is taken.f Automatic Sensor CleaningActivating the Sensor Cleaning ManuallyWhen Multi Shot Noise Reduction is set, [Clean nowf] cannot beselected. For best results, perform the sensor cleaning with the camera placedupright and stable on a table or other flat surface. Even if you repeat the sensor cleaning, the result will not improve much.Immediately after the sensor cleaning is finished, the [Clean nowf]option remains disabled temporarily. Dots of light may appear on images if the sensor is affected by cosmicrays, etc. By selecting [Clean nowf], their appearance may besuppressed (p.466).
