Double lens reflex camera can introduce
5. The lens interchangeability is limited. If you replace the camera lens, you must also replace the viewfinder lens. Today's TLR cameras typically provide interchangeable dual lens devices.
6. Imaging on the contrary.
3. Must be in the waist down the way to watch the front of the object will make the operation very inconvenient. The modern TLR camera adds an eye view of the Porro viewfinder to overcome this shortcoming.
4. Dual lens system on its inherent characteristics, the larger, and the replacement of the lens, you need to replace the two lenses at the same time; for today's large aperture fast lens, is indeed a problem.
1. As the framing lens is separated from the photographic lens, the TLR has a parallax problem (ie, no WYSIWYG) as with the side viewfinder camera. In the shooting of close objects when the problem brought about by the drawbacks will be more obvious. So some modern TLR camera framing system built-in parallax automatic compensation device.
2. The image on the ground glass is not very bright compared to the optical viewfinder or range finder.
Dual lens mirror viewfinder camera, referred to as "double reverse camera". This system consists of two sets of lenses with the same focal length. The top lens is usually unable to adjust the aperture, only the use of framing; the lower lens with a shutter shutter adjustment device for the actual exposure. Double reverse system structure is simple and durable, has been widely accepted by reporters and the public. But because of its inherent parallax and lens restrictions, is now less production and use.
