Twin Lens Reflex camera. A fixed mirror replaces the SLR's flip-up mirror, so making this design very quiet. (Medium Format) 6cmx6cm. Rollei is the best known. (see Medium format, Parallax error & SLR )
Twin Lens Reflex. Twin Lens Reflex cameras have two lenses. The upper lens is used to view the scene while the lower one is used to expose the film. One problem with TLR camera is called the Parallax effect. When photographing an object at a close range, the film does not "see" what the photographer sees because of the angle of the two lenses.
see “Twin Lens Reflex” below.
TLR cameras are usually a larger format than 35mm (typically 2 1/4" square). They usually do not allow for the exchange of lenses and are far less comon than SLR or even rangefinder cameras.
Twin lens reflex camera that have separate viewing and actual exposure lens. Rollei still have one in production.
Twin Lens Reflex. There are a few Medium Format cameras which have two separate lenses on the camera, one above the other. These cameras are known as Twin Lens Reflex (TLR) cameras. These cameras use the upper lens for viewing and the lower lens for exposing the film. The light is refracted through a prism and focusing screen to allow the user to observe the image. One problem with TLR camera is known as the parallax effect. When photographing objects close to the camera the object that the viewer sees will not be exactly the same as the image the fill will see.