Why do you have to use a SLR for photography?

Because the photosensitive element is small, the physical focal length of DC lens is relatively short, mostly between 5 mm and 20mm, while the physical focal length of SLR lens is generally above 20 mm, and the common focal length is 50mm+. The physical focal length determines the depth of field, which determines that the SLR will have better depth of field performance and get well-defined photos.

In addition, due to the limitation of structure, dc can not achieve phase detection focusing on SLR, and the focusing speed is very different, and DC also has the problem of shutter lag. .......

In addition, the large-size photosensitive element of digital SLR also determines the improvement of imaging quality, and it is also a big factor that the optical viewfinder surpasses the electronic viewfinder screen in response speed and tolerance.