The traditional SLR camera uses the five prism optical viewfinder. It needs a reflector cavity, which means the flange distance is the distance between the flanges and the flanges from the mounting flange to the parallel light of the incident lens. No longer than the mirror. DC, the volume is difficult to control, so the SLR camera gives people the feeling is always fierce too inconvenient to carry. As technology continues to mature, it has been found that the SLR camera can cancel the optical viewfinder and reflector chamber. The micro single camera is based on this design idea, and the micro 4/3 system reduces the flange distance by 50%.
Why can SONY's single camera transfer the lens of most of the lens manufacturers, known as "universal transfer"? The biggest reason is the achievement of this advantage body flange from ultra short distance is only 18mm between the body from the lens mount to CMOS sensor focal plane, and most are from the flange of the camera lens is greater than this value, which provides the possibility for the next transfer, shaft, and other SLR lenses through ring mounted in a single micro the camera on the shooting. In simple terms, is a short distance through the body flange ring than it use any flange from long shot, because we can ring the thickness of the fuselage and the lens from the flange, the flange body itself, but if distance is very long, if you want to transfer flange from short shot, the only way to be thin body thickness, it is impossible to achieve!
A: a normal switch ring enables the light to focus correctly on the photosensitive component, which is far away from the focus.
B: the focus position of the lens is shorter than that of the mirror. The light is focused before it reaches the focal plane, and it can't be far away from the focus.
C: the focus position of the lens is longer than that of the mirror. The light is not focused when it reaches the focal plane, and can be corrected through the thickening switch ring.
The flange distance, the flange focal distance, is the distance between the assembling flanges to the converging point of the incident light of the incident lens. The flange focal length of the fuselage of the same card is equal to the lens flange focal distance, that is, a type of card has only one flange focal length. Too long or too short the flange can cause the lens to converge to focus on the focal plane, and the focus can not be achieved.
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