An SLR camera, also known as SLR or DSLR (Digital Single Lens Reflex), comes in all shapes and sizes. These cameras have an interchangeable lens system. You can watch images via the optical viewfinder or the screen. There are SLR cameras for the beginner, advanced, or expert. You can choose between brands like Nikon and Canon. You can also choose your SLR by looking at the usage situation or the type of image sensor that you need. An SLR camera has an APS-C or full-frame sensor.