Smith Week #1: Rangefinder & Single-lens Reflex Cameras

Rangefinder cameras preceded the single-lens reflex cameras (SLR) and were first used in the 19th century. At the time they were known as telemeters. In its simplest form, a rangefinder is an accessory device attached to a 35mm camera that enables the photographer to measure distance between the camera and the subject while also taking clearly focused photos. Rangefinders became standard on most mass-produced cameras in the 1930s and were eventually incorporated into the viewfinder.

Rangefinder as accessory

Rangefinder standard

Rangefinder cameras dipped in popularity as the single-lens reflex camera gained market share through the 1970s. The name 'reflex' comes from the motion the internal mirror behind the lens makes when a photograph is taken as it shifts up then down to expose the film. Single-lens reflex cameras have the added benefit of showing the photographer exactly what the photo will be before it is taken, as opposed to the different framing experienced on a viewfinder camera.

Single-lens reflex camera diagram