What does SLR mean?

SLR has two meanings. Optically, SLR refers to Single Lens Reflex, that is, single lens reflex, and single lens reflex digital camera, that is, digital digital, single lens, lens and reflex.

It can make the images seen in the observation window always consistent with those on the film, and its framing range is basically consistent with the actual shooting range, eliminating the parallax phenomenon of the paraxial head-up framing camera. In sports, it refers to one of tennis backhand techniques. Tennis backhand techniques include one-handed backhand (referred to as "SLR") and two-handed backhand (referred to as "double backhand"). The SLR is elegant and stable.

Extended data SLR camera (SLR camera) is also called SLR camera. Refers to a camera that uses a single lens, through which light shines on the reflector and takes a view through reflection.

The so-called "single lens" means that the photographic exposure light path and the framing light path * * * use one lens, unlike the paraxial camera or the double-reflex camera, the framing light path has an independent lens. "Reflection" means that a plane mirror in the camera separates the two light paths: the mirror falls when taking a view, reflects the light of the lens to the pentaprism, and then reflects it to the viewing window.

Compared with paraxial cameras, SLR cameras have the advantage that what you see is what you get, and the imaging angle in the viewfinder is the same as the final film. However, compared with paraxial camera, the back focus of SLR camera lens can be imaged at the focal plane of reflector and photosensitive element at the same time, and a false focus must be generated before imaging the focal plane.

Reference SLR _ Baidu Encyclopedia