I've heard that the ultra short flange distance can help micro transfer more lenses. What's the principle? Why is the long distance SLR not the advantage? What does the flange distance decide?
The average flange distance refers to the distance between the metal ring on the camera body and the lens, which is in contact with the lens, to the imaging medium (photosensitive element or negative plate),This distance is longer, plus the transfer ring is longer, the focus is not easy, to the imaging medium, that is, with the transfer ring, can not focus.And the distance between the flanges is short, and the adapter ring will not be too long.
From the flange (also called plane distance) is a bayonet to the distance of CMOS, no single micro reflector, so the distance is far less than the need for a middle SLR plane reflector distance.Because the micro distance short because of the single phase, so as to add the appropriate thickness of the transfers, will be extended to and from surface consistent SLR SLR Lens can be used.To the lens and distance is very easy, but take a short distance plane lens to face away from the body of the appearance (such as micro single lens to the SLR above), the need to re design of lens group structure, it is not possible to achieve.Short distance single micro physiognomy, in addition to transfer other shots, really is not an advantage, but a short distance of the defect, the surface will make the lens body, according to the CMOS center and the light around the serious imbalance, if there is no design after the digital camera, camera lens, such as the old paraxial lens then, after the four angle will produce severe dark and UV phenomenon.
A bayonet lens corresponding to a personal opinion corresponding to a flange from.Due to the optical characteristics of the lens, the lens is designed to fix the distance from the lens to the sensor, so that the focus can be achieved only at the distance of the flange.The length of the flange is too long or too short to cause the focus of the lens to focus on the focal plane.A short distance can be added through the flange ring to increase flange (virtual) distance, the lens can focus to the afterimage photosensitive element.The long flange spacing can not be shortened without damaging the fuselage.
The shorter the flange distance of a single camera, the better the edge quality.The flange distance refers to the distance between the mounting flange and the converging point of the incident lens parallel light, which is the distance from the fuselage lens to the sensor.Micro single flange distance is shorter and shorter, for example, just released Fuji X-pro 1 flange distance is only 17.7mm, compared to SONY E bayonet 18mm and Micro 4/3 system 20mm is shorter! Flange recall system SLR and paraxial distance, we will find that both the Nikon F, Canon EF or other Pentax K is about 45mm, the Leica M bayonet flange distance in 27.8mm, compared to the current micro single are very!SLR due to the presence of reflecting plate flange from natural than no reflector micro single and paraxial long, this is not what doubt, however you may have heard, paraxial edge quality generally better than the SLR, and micro single edge quality is better than the paraxial.In fact, the pinhole imaging principle and imaging camera lens can be seen as similar, cardboard and hole, and the sensor is wall, so it is not difficult to understand, when the camera sensor distance closer, the amount of light received on the central and edge closer to the sensor, so the quality is more close, this is also the reason why the micro single flange distance is small the better the quality of edge.
