Why can a SLR camera take pictures on a horizontal plane?

Electronic induction level. You can see it directly in the viewfinder, and your camera can refer to it to know whether your camera is level or not. For example, if the horizon is tilted, it will look very uncomfortable. Didn't your size get smaller after PS cutting? Originally1414 *1414, you tilted 45 and only cut to 1000* 1000. Of course, this is an analogy. Some of your cameras are tilted, but you may think that the person standing is tilted. As a result, once calibrated, the film comes out at an angle with the horizon, which may be 2, and your PS can't handle it. PS is always a remedy.

A camera is an optical instrument used for photography. Its lenses are equivalent to those in human eyes. When the shutter is pressed, the light reflected by the photographed object will enter the camera through the lens, and the aperture on the camera can adjust the light intake to prevent underexposure or overexposure.