noun: a type of camera with one lens which is used both for viewing and taking the picture
Single lens reflex camera. Uses a viewfinder system with a mirror and focussing screen.
a Single Lens Reflex camera
The most expensive of all digital cameras, digital SLRs offer complete manual control, higher resolution, advanced exposure control, and the benefits of detachable lenses. Due to the lens design, digital SLR's are not capable of shooting video.
Single Lens Reflex - With these types of cameras, the viewfinder shows the view seen through the lens of the camera.