A DSLR (Digital Single-Lens Reflex) camera is a digital imaging device that uses a mirror and prism system to allow the photographer to see exactly what the lens sees through an optical viewfinder. The term DSLR combines digital imaging technology with the single-lens reflex mechanism first popularized in film cameras. Brands such as Canon, Nikon, and Sony have produced widely used DSLR models for professional and enthusiast photographers. The core working principle of a DSLR involves a reflex mirror positioned between the lens and the image sensor. When light enters through the lens, it strikes the mirror, which reflects it upward into a pentaprism or pentamirror. The prism then redirects the light to the optical viewfinder, allowing the photographer to compose the shot in real time with accurate framing and exposure preview. When the