Video yourself with Canon SLR, how to focus, and how to follow the focus?

Single-lens reflective video recording, tripod, "simulated" focal length before shooting, and face priority mode of camera focusing setting. When shooting, the camera will (automatically) track the focus of the face and follow the focus. The premise is that this camera after SLR (Canon 5D3\ Nikon D800) has this function.

Open the camera settings as follows:

Digital SLR camera is a single lens reflex digital camera, referred to as SLR (single lens reflex). This technology is to install a mirror at a 45 angle in front of the film plane, and there are frosted glass and pentaprism eyepiece above the mirror in turn. The pentaprism reflects the real image light many times to change the optical path, and sends the image to the eyepiece, so that the image seen in the observation window is always consistent with the image on the film, and the shooting range is basically the same as the actual shooting range. The unique design of this prism enables the photographer to directly observe the image passing through the lens from the viewfinder.

DSLR digital camera refers to a single-lens reflex digital camera, that is, digital, single-lens, lens and reflex. Representative models in the market are common in Nikon, Canon, Pentax, Fuji and so on. In the early days, this kind of camera was generally big and heavy.