Reflex camera (Reflex camera) double lens (Twin Lens Reflex) or called TLR camera, which was very popular in the days before. This type of camera lenses 2. The lens on duty reflect into the viewfinder mirror reflection which is the film room visible objects to taking a symmetric lens below serves up the sun. To shine through the film. Reflex camera lens design combines the advantages of these big camera (View Camera) and camera range finder (Range finder) together, especially can look at the pictures from above the camera the camera down. Looking at pictures from the viewer"s eyes was comfortable. However, this type of camera also has disadvantages, because the lens 2, located in vertical to each other. So the visual image from the lens on may not be the same with footage, which is called the symptoms held off from cutting parts of the image (Parallax). The more a picture near some of the images will be cut off, even when looking at the viewfinder is a complete picture, another picture of the viewfinder is back left is right. In addition, this type of camera lens is mostly not. It is a disadvantage as well used film may be the Size 120 127 220,, or 35 mm.