How does Canon SLR focus?

For a single autofocus, as long as the shutter is pressed halfway, the red dot in the camera viewfinder will light up, indicating that the focus is complete. If you want to adjust the focal length, you can dial the dial next to the shutter, select the focal length, and then press the shutter half-way. When focusing, press the shutter completely to get a clearly focused photo.

When the camera is set with artificial intelligence focusing or artificial intelligence servo focusing, the camera will intelligently identify moving objects and make corresponding adjustments. In the artificial intelligence focusing mode, the focusing operation is the same as single autofocus.

Most SLR lenses have switch keys for manual focusing and autofocus, and the words AF and MF on the lens are the switch keys for manual focusing. In manual focus mode, you can select the focus by rotating the focus ring on the lens. This mode is mainly used in low-light and low-contrast environments or scenes with complex graphics, because in these cases, the camera's autofocus system will fail and it is impossible to find the prepared focus. In these cases, the best way is to focus manually, observe the scene to be shot from the viewfinder, rotate the focus ring on the lens and select the prepared focus.