Canon EOS Rebel T4i Instruction Manual - Page 219
Automatic Sensor Cleaning
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f Automatic Sensor Cleaning Whenever you set the power switch to or , the Self Cleaning Sensor Unit operates to automatically shake off the dust on the front of the sensor. Normally, you need not pay attention to this operation. However, you can choose to perform sensor cleaning at any time, or disable it. Cleaning the Sensor Now 1 Select [Sensor cleaning]. Under the [53] tab, select [Sensor cleaning], then press . 2 Select [Clean nowf]. Select [Clean nowf], then press . Select [OK] on the dialog screen, then press . X The screen will indicate that the sensor is being cleaned. Although there will be a shutter sound, a picture is not taken. For best results, perform the sensor cleaning with the camera placed upright 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 will remain disabled temporarily. Disabling Automatic Sensor Cleaning In step 2, select [Auto cleaningf] and set it to [Disable]. X The sensor cleaning will no longer be executed when you set the power switch to or . 219