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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 mounting flange (the interlocking metal rings on the camera and the rear of the lens) to the film or image sensor plane. This value is different for different camera systems. The range of this distance, which will render an image clearly in focus within all focal lengths, is usually measured to a precision of hundredths of millimetres, and is not to be confused with depth of field.
Lenses can be adapted from one mount (and respective FFD) to another. FFD determines whether infinity focus can be accomplished with a simple non-optical adapter. Optics to correct for distance introduce more cost and can lower image quality, so non-optical lens adapters are preferred. A simple non-optical adapter holds the longer FFD lens the appropriate additional distance away from the sensor or film on the shorter FFD camera. A camera body with a shorter FFD can accept a larger number of lenses (those with a longer FFD) by using a simple adapter. A lens with a longer FFD can be more readily adapted to a larger number of camera bodies (those with a shorter FFD). If the difference is small, other factors such as the sizes and positions of the mounting flanges will influence whether a lens can be adapted without optics.
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camera, the flangefocaldistance (FFD) (also known as the flange-to-film distance, flangefocal depth, flange back distance (FBD), flangefocal length (FFL)...
SLR Four Thirds bodies. Micro Four Thirds reduced the specified flangefocaldistance from 38.67mm to 19.25mm. This reduction facilitates smaller body...
FD-mount cameras it produced, the New F-1, T90, and T60. The 42mm flangefocaldistance of the FD mount is shorter than that of most other lens mounts....
released by Olympus and Panasonic in 2008; lenses built for MFT use a flangefocaldistance of 19.25 mm, covering an image sensor with dimensions 17.3 × 13...
Register.com, a domain registrar Camera register or flangefocaldistance, distance from the mounting flange to the film plane of an interchangeable lens camera...
thread diameter 15.88 mm (0.625 inch) Mount thread pitch 32 TPI Flangefocaldistance 12.29 mm D-Mount lenses have found new uses in the Nikon 1 series...
included Carl Zeiss, Rolleinar, Schneider, and Voigtländer. QBM has a flangefocaldistance of 44.5 mm. The aperture ring should be set to its maximum position...
UN 2A" in the ANSI B1.1 standard for unified screw threads. The flangefocaldistance is 17.526 millimetres (0.6900 in) for a C mount. Merely to say that...
different mount shape that will not fit on the earlier cameras. The flangefocaldistance between mount and film is 47 mm. On 5 March 2009, Leica announced...
or longer, based on the respective flangefocaldistance of the lens and camera being adapted. Flangefocaldistance is the key specification in determining...
wider focal length lenses which must be positioned closer to the film plane. A recessed lens board effectively reduces the flangefocaldistance of a camera...
Rolleiflex SL35 line uses QBM (Quick Bayonet Mount) mount, with a flangefocaldistance of 44.5 mm. The QBM was re-used by Rollei for the Rolleiflex SL 2000 F...
flangefocaldistance 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...
Takumar lenses adapted to Canon full frame cameras. On bodies with a flangefocaldistance greater than that of M42, most notably Nikon, three options are...
their long focalflangedistance, mirrorless interchangeable-lens cameras can use EF lenses with a mechanical adaptor that bridges the distance. Red Digital...
device Flangefocaldistance Focus film distance Forward flank downdraft, or front flank downdraft Free-form deformation Front focaldistance First fit...
5.6× (compared to full-frame 35mm cameras), as well as a short flangefocaldistance (FFD). With the 5.6× crop factor, a 100mm macro lens (for example)...
with 1.52 µm pixel pitch. All Pentax Q system cameras have a short flangefocaldistance (FFD) of 9.2mm. With a 5.53× crop factor, an adapted 100mm lens...
released by Olympus and Panasonic in 2008; lenses built for MFT use a flangefocaldistance of 19.25 mm, covering an image sensor with dimensions 17.3 × 13...
mount's flangefocaldistance at 20 mm is much shorter than that of the Canon EF and EF-S mounts at 44 mm. The EF-M mount has a flangefocaldistance of 18 mm...
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