The SLR in the camera is a single-lens reflector. The biggest feature is that it has a lens and a reflector. A lens with a certain inclination angle is installed behind the lens. When shooting, it reflects light into the viewfinder above for people to watch, while when shooting, it lifts the reflector to provide light for the photosensitive materials (photosensitive elements) behind it.

In this system, the unique design of the mirror and prism enables the photographer to directly observe the image passing through the lens from the viewfinder. Therefore, you can accurately see the same image that the film is about to "see".

Extended data

The viewfinder will be blocked when you take a picture. Because the shielding time is only a moment, this is not a big problem for the image that is reset immediately. However, it also raises some emergency issues. For example, when using stroboscopic shooting, you will not be able to see whether the stroboscopic device flashes normally through the viewfinder.

The noise of the rearview mirror moving. This may become an important problem where silence is needed. Because there is no moving mirror that suddenly blocks the light path in the ranging camera, this noise will not be generated.

Baidu encyclopedia-SLR digital camera