What does SLR mean?

SLR refers to single lens reflex, or SLR (single lens reflex), which is the most popular viewing system today. A camera that uses a SLR system for viewing is called a single-lens reflex camera, or SLR camera or SLR for short. To put it simply, it is the body of a commonly seen "cannon" (telephoto lens) camera. The current mainstream SLRs include Canon, Nikon, Pentax, Sony, Fuji, etc.

In this SLR system, the unique design of the reflector and prism allows the photographer to directly observe the image through the lens from the viewfinder. As can be seen in the structural diagram of a single-lens reflex camera, after the light passes through the lens and reaches the reflector, it is refracted to the focusing screen above and forms an image. Through the eyepiece and pentaprism, we can see outside in the viewing window scenery. When shooting, when the shutter button is pressed, the reflector will pop up, and the shutter curtain in front of the film will be opened at the same time. The light (image) passing through the lens will be projected onto the film to make the film sensitive, and then the reflector will immediately recover. In its original state, the image can be seen again in the viewing window. This structure of a single-lens reflex camera ensures that it is completely focused through the lens. It can make the image seen in the viewing window always the same as on the film. Its viewing range is basically the same as the actual shooting range. , which eliminates the parallax phenomenon of range-axis head-up viewfinder cameras. From the perspective of learning photography, it is very conducive to intuitive framing and composition.

Advantages of single-lens reflex cameras: 1. Lenses of various focal lengths can be replaced and used; 2. The imaging effect is very good. 3. You can use the telephoto lens to shoot farther scenes. etc.

Disadvantages: 1. The price is relatively expensive; 2. Large size and heavy weight. Of course, there are also differences in grade among SLR cameras. Entry-level ones are cheaper, while more professional and advanced cameras, lenses, and accessories are all expensive.