Regardless of the camera, the image sensor (photosensitive element, CCD, COMS) is a key component and is the heart of the camera. However, for cameras such as micro-single and SLR with interchangeable lenses, since the sensor has a short time to contact the outside air when changing lenses, it may cause pollution. After a period of use, dust, oil, or even mildew may adhere to the sensor. Imaging. If your lens is clean and the picture is smeared, or if it is not on the subject, it may be that the sensor is contaminated.

How to determine if the sensor is contaminated? First focus the camera at infinity, take a picture of the clean white paper (or against the pure blue sky) at a distance of about 10cm to see if there are stains and plaques. If so, clean the surface of the lens at both ends of the lens first, and then observe whether the inside of the lens is ash. If it is confirmed that the inside and outside of the lens are clean or stained and plaque, it is likely that the sensor is contaminated. So how to avoid and reduce sensor pollution, how to clean it after pollution?

How to avoid and reduce pollution sensors when used normally?

1. Do not let the hand and any other objects touch the sensor at any time;

2. Try to change the lens in a relatively clean environment. When the lens is changed, the lens is quickly replaced obliquely downward. Do not change the lens in a harsh air environment (such as sandstorm environment, construction site, smog environment, etc.). If you need to change the lens in an unclean environment, it is recommended to use a lens-proof dust bag. Of course, it is more difficult to change the lens. There is still a cigarette in his mouth;

3. If the air environment is humid, it is recommended that the camera be stored in a dry box when not in use to avoid mildew.

Second, how to clean the sensor after it is contaminated?

Even if you pay attention to it when you use it normally, the sensor will still accumulate dust after a long time of use. So, what should I do if the image sensor is contaminated? It is generally recommended to send the camera to the special maintenance department, because the camera is a very precise optical instrument, and the camera sensor is very fragile, causing a large loss once it is damaged. If you have a good knowledge of sensor cleaning and you are confident that your cleaning will not damage the sensor, please pay attention to the following points when cleaning the sensor:

1.Micro-single generally removes the lens sensor and the sensor is displayed. However, the SLR has a reflector and a curtain shutter. Although the B-door can also be used to open the reflector and the curtain shutter, but Do not use this method because the mirror will rebound and damage the machine during the cleaning process. SLR cameras generally have a manual cleaning sensor function menu that pops up the reflector and opens the curtain shutter. For example, the Nikon camera's ¡°Lock up the reflector for cleaning¡± menu function is used to clean the sensor;

2.do not wipe the sensor with a cotton swab, cleaning cloth, cleaning paper, lens cloth, lens paper and other things with fiber, otherwise the fiber will stick to the sensor, resulting in clearer and dirty, must use a dedicated sensor cleaning tool;

3.The recommended cleaning tools for the sensor are: blown air balloon, special compressed air cleaning tank, sensor cleaning rod, sensor vacuum cleaner, etc. Blowing balloons can only blow loose dust, and the stains stuck on the sensor can't be cleaned. The tool for further cleaning is the preferred sensor cleaning bar. The sensor-specific compressed air cleaning tank and sensor vacuum cleaner are difficult to clean and stubborn stains, and the sensor The price of the vacuum cleaner is too high and not very cost-effective.

4.when using the sensor cleaning rod should pay attention to only one-way brush light force, do not repeatedly brush back and forth, otherwise it will cause secondary pollution.

In short, if the camera image sensor is contaminated, it should be judged in time to make the photo clearer and more transparent. Once it is found that it is contaminated and sent to the professional special maintenance department in time, if you are ready to clean yourself, you must master the knowledge of sensor cleaning. In normal use, the protection of the sensor is emphasized, and the pollution of the sensor is minimized.