Traditional Culture Encyclopedia - Photography major - What's the use of a camera with a lens?

What's the use of a camera with a lens?

Adding another lens to the lens is often to expand the wide-angle effect or extend the focal length of the lens. This is a simple method, and it is impossible to expand the camera's angle of view with different lenses.

To achieve a better and more perfect effect, we have to use a SLR camera and change the lens with different focal lengths to solve it. ...