The sensor is made up of millions of light-sensitive elements, each around 6 to 8μm square. It does not need a very large piece of dust or dirt to cover one or more of these elements, or pixels. If a pixel is obscured, it does not receive much light and so that portion of the image will record as grey. These grey areas are most noticeable in light-toned areas of the photograph.
Do you have dust on the sensor of your digital camera? Can you see small grey spots in light-toned areas, such as skies?The marks will be grey and fuzzy because the dust is not actually in contact with the surface of the sensor. Instead, dust rests on the surface of the low-pass filter that lies on top of the sensor. The gap between the sensor and the dust is enough to throw the spots out-of-focus and allow some light to creep underneath.
Whatever precautions you take, one day the sensor will need cleaning. Canon approves only two methods. The first method you can try yourself using a rubber air blower. The second involves sending the camera to a Canon Service Centre.To use the air blower technique, switch the camera to its sensor-cleaning mode. This does not actually clean the sensor - it just gives access to the sensor by raising the reflex mirror and opening the shutter blades. It is recommended that you run the camera from a mains power supply, via a DC coupler, when using this mode, so that you are not relying on battery power to keep the shutter open.Sensor cleaning mode is accessed in the same way on all the EOS professional digital cameras. While pressing the ‘Menu’ button, select the set-up menu screen (set-up 2 menu on the EOS-1D Mark II, EOS-1D Mark II N and EOS-1Ds Mark II). While pressing the ‘Select’ button, select ‘Sensor cleaning’. Release and press the ‘Select’ button and select ‘OK’. Release the ‘Select’ button and the LCD screen will show ‘Sensor cleaning’. Press the shutter button and the mirror will lock up and the shutter will open. Check the camera instruction manual if you need further details.
According to foreign media reports, dlhBOWLES will participate in the 2019 International Consumer Electronics Show.Demonstrate its Sensor Cleaning Systems technology at LeddarTech's Leddar Ecosystem Pavilion.