Why is there a symbol showing WeChat plus camera on the control center?

Because it is the symbol of the system, it was developed by the software designer.

Most SLR cameras still retain a similar symbol, which existed as early as the film age. It represents the plane position of the film and helps the photographer to measure the focus distance, because the focus position of the lens is calculated by the photosensitive plane. There was no autofocus before, and this symbol is very important, because it is not necessarily accurate to judge the focus with the naked eye. For example, when shooting macro works, this symbol can be used to measure the exact distance between the subject and the film plane, which is helpful to shoot clear macro subjects. In this case, the viewfinder focusing screen cannot be used for focusing. In the digital age, the focal length is actually measured from this position, which can be used as a standard when using manual lens. Of course, is there a detailed scale for the focus ring of the lens now? This is also questionable. Actually, this symbol is dispensable. Nowadays, most digital cameras have real-time viewing function. If autofocus is not possible, use the live view screen of LCD. For ordinary photographers, this symbol is not needed at all. Therefore, this symbol has become a "decoration", but it reminds us that it once shouldered the heavy responsibility of assisting focusing. Don't mind continuing to engrave on the camera, it will always be the historical imprint of photography.

There is a camera in the upper right corner of WeChat, which is used to post dynamic information, such as uploading photos and videos, recording happy things and sharing them with friends in your circle of friends.