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Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...
Generally, a lens can be easily adapted to a camera body with a smaller flange focal distance by simply adding space between the camera and the lens. When attempting to adapt a lens to a camera body with a larger flange focal distance, the adapter must include a secondary lens in order to compensate.
On bodies with a flange focal distance greater than that of M42, most notably Nikon, three options are available. A simple mechanical adapter allows the lens to be mounted, but the effect is similar to the introduction of an extension tube, reducing the minimum focus distance at the expense of losing infinity focus.
CS-mount has a flange focal distance of 12.526 millimetres (0.4931 in), [4] [5] compared to 17.526 millimetres (0.6900 in) for a C mount, but is otherwise the same as C-mount, including the fact that lenses for many different formats are made for it. CS-mount lenses are built for the smaller formats, 1/2 inch and down.
The M system has an 18 mm flange focal distance (compared to 20 mm for RF and 44 mm for EF and EF-S) and a 47 mm throat diameter (compared to 54 mm for EF, EF-S, and RF). As it is designed for use with an APS-C -sized image sensor , it features the same crop factor (of roughly 1.6) as the existing EF-S lens mount.
The Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35mm format single-lens reflex cameras.The F-mount was first introduced on the Nikon F camera in 1959, and features a three-lug bayonet mount with a 44 mm throat and a flange to focal plane distance of 46.5 mm.
FD lenses can also be mounted to current mirrorless digital cameras with short flange focal distance, using simple mechanical adapters without optical correction. FD lenses, especially wide and ultra-wide f/2.8, f/2 and f/1.4 variants, have proven popular options for videography for these mirrorless formats.
True LTM lenses have a flange focal distance of 28.8 mm, though this is of little importance for lenses used on bellows enlargers. The Soviets later adopted the LTM mount for their Zenit single-lens-reflex (SLR) cameras, though with the longer optical registration of 45.2 mm, required to allow the mirror room to flip out of the focal path when ...