SLR mirror is dirty. What is clean?

Find a room with no wind and clean air. First, take off the lens and blow it with air. Then, turn the camera to time-lapse photography. After a long exposure, the mirror will open and blow it with air. Pay attention to the mouth down, you can fix it with a tripod, which should solve it.

1. In order to avoid the refraction of mirror glass, an optical medium, and affect the focusing accuracy, the mirror of a SLR camera is different from the ordinary mirror. Instead of coating a reflective film on the back of the glass, it is directly coated on the front.

2. Therefore, the mirror can't be wiped at will like an ordinary mirror. Hard wiping will damage the surface coating, resulting in incurable scratches, and the more you wipe, the more flowers you get. Try to avoid wiping the mirror yourself without affecting the framing and focusing.

3. After the surface of the coating is polluted, it can only be gently wiped with soft cotton. In case of particularly obvious scratches, we can only go to the brand's special maintenance department to replace the mirror, but the spare parts and working hours are low.