Canon camera failed to shoot, and err 20 was displayed.

1. Cause of failure: err 20- Mechanical failure detected.

Second, the solution when ERR20 appears, first replace a lens, then turn on the switch and try again. If this prompt continues to appear, because the mechanical part of the digital camera is not as important as the film camera now, it can be concluded that the main faults are:

1. Mechanical failure related to shutter assembly, as shown in the figure below.

2. If the mechanical parts related to mirror lifting fail, you need to go to Canon Special Center for consultation and testing.

Extended data

If sand or other hard particles are attached to the lens surface, it is easy to scratch the lens surface. It's time to clean the lens.

When wiping the lens, never use ordinary soft cloth or paper material, which is easy to scratch the lens surface. We should also use some special lens paper with caution, because some lens paper is chemically treated, such as some special cleaning paper for glasses, which may damage the special protective film on the lens surface. Therefore, when cleaning the lens, the best choice is to use the special cleaning tools for digital cameras. You can go to the camera franchise store to buy it, and according to the actual situation, you can cooperate with the lens-specific cleaning solution to get a satisfactory cleaning effect.

The best maintenance of the lens is to take care of it in normal use, and form the habit of covering the lens cover in time when shooting. Because this is the most effective way to maintain the lens.

Refer to Baidu Encyclopedia camera lens