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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.

Standard mounts

Typically, camera bodies with shorter flange focal distance can be adapted more readily to lenses with longer flange focal distance.

Zdroj:https://en.wikipedia.org?pojem=Flange_focal_distance
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Mount	Flange focal distance	Type	Format	Production	Prime lenses	Zoom lenses	Wide/tele converters	Mount converters	Comments
Samsung NX mini	6.95 mm	Mirrorless	1"	2014–2015	2	1
Pentax Q-mount	9.2 mm[2]	Mirrorless	1/2.3" (6.17×4.55 mm) / 1/1.7"	2011–2019	5	3	0	1
M58×0.75 mm mount	12 mm	Industrial	24×36 mm						Industrial area and line scan cameras
D-mount	12.29 mm	cine	8 mm						(8 mm movie cameras)
CS-mount	12.526 mm[3][4][5]	TV	1/4", 1/3", 1/2"						(surveillance cameras)
Nikon Z-mount	16 mm	Mirrorless	24×36 mm	2018–	19	11		1
			APS-C (DX)	2018–	1	4	2		Can use any of the 24x36 mm lenses and the FTZ/FTZ II mount adaptor.
DJI DL-mount	16.84[6]	Mirrorless	Super 35	2017–	4	0
Nikon 1-mount	17.00 mm[7]	Mirrorless	CX	2011–2018	3	8		1
C-mount	17.526 mm[8]	cine / TV	8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3"	~1926–					(Bolex, Eclair and Bell & Howell)
Fujifilm X-mount	17.7 mm	Mirrorless	APS-C	2012–	23	14	2	1[9]
Canon EF-M-mount	18.00 mm	Mirrorless	APS-C	2012–	3	5	0	1
Sony E-mount	18.00 mm	Mirrorless	APS-C	2010–	6	14	4	2	Lens count doesn't include 3rd party products. All FE lenses (see below) can also be used on APS-C E-mount cameras.
			24×36 mm (FE)	2013–	22	17	4	3	Lens count doesn't include 3rd party products.
Sony FZ-mount	19.00 mm	cine	Super 35	2011–	0	2	0	3
			24×36 mm	2015–	1	2
Micro Four Thirds System	19.25 mm	Mirrorless	4/3"	2008–	37	28	1	1
Hasselblad XCD mount	18.14 mm (+0.05/-0.00)	Mirrorless	Medium Format (127) 43.8×32.9 mm	2017–	13	1		3	for Hasselblad X System
Canon RF mount	20.00 mm	Mirrorless	24×36 mm	2018–	12	11		3
Leica L-Mount (formerly CL-mount)	20.00 mm	Mirrorless	24×36 mm, APS-C	2014–	19	12
JVC 1/3" bayonet mount	25.00 mm	TV	1/3" 3-CCD (5.24×2.94 mm)
Samsung NX-mount	25.50 mm	Mirrorless	APS-C	2010–2015	8	8
Fujifilm G-mount	26.7 mm	Mirrorless	Medium Format (127) 43.8×32.9 mm	2017–	7	2	1		for Fujifilm GFX series cameras
Pentax Auto 110	27.00 mm	SLR	13×17 mm	1978–1985	5	1	0	0
RED ONE interchangeable mount	27.30 mm	cine
Leica M-mount	27.95 mm[9]	Mirrorless	24×36 mm	1954–					aka Voigtländer VM-mount, Epson EM-mount, Zeiss ZM-mount as well as Konica KM-mount (Hexar RF) and Minolta M-mount (CL/CLE)
Nikonos	28.00 mm[10]	underwater	24x36 mm	1963-2001	6	0	0	0	this is the underwater scale focusing camera
M39×26tpi mount	28.80 mm	Mirrorless	24×36 mm						Leica M39×26tpi aka LTM (Leica Thread Mount) aka L39 (not to be confused with M39×1)
M39×1/28.8 mount	28.80 mm[11]	Mirrorless	24×36 mm	1948-1978					Zorki M39×1/28.8 for Zorki cameras (not to be confused with M39×1 and M39x26tpi)
Contax G-mount	29.00 mm	Mirrorless	24×36 mm	1994–2005	6	1	0	1
Olympus PEN F (film)	28.95 mm	SLR	18×24 mm	1963–1972	16	2
Hasselblad XPan	34.27 mm	Mirrorless	24×36 mm & 24×65mm	1998–2003	3	0	0	0	Identical to Fujifilm TX series cameras and mount
Contax RF-mount	34.85 mm	Mirrorless	24×36 mm
Nikon S-mount	34.85 mm	Mirrorless	24×36 mm	1947–2005
1/2" TV bayonet mount	35.74 mm	TV	1/2" 3-CCD						JVC, Hitachi, Panasonic, others, but not Sony
Minolta V-mount	36.00 mm	SLR	APS-H	1996–1999	3	5	0	1	Vectis S-1, Vectis S-100, Dimâge RD 3000
Sony 1/2" TV bayonet mount	38.00 mm	TV	1/2" 3-CCD
Olympus Four Thirds System	38.67 mm	SLR	4/3"	2003–2017	12	30	2
Aaton mount	40.00 mm	cine	16mm/S16
Panavision SP70-mount	38.00 mm	cine		2018–					35 mm & 65mm
Konica F-mount	40.50 mm	SLR	24×36 mm	1960–1965	17	0	0	0
Konica AR-mount	40.50 mm	SLR	24×36 mm	1965–1988	36	16	1	0
Canon FL-mount	42.00 mm	SLR	24×36 mm	1964–1971
Canon FD-mount	42.00 mm	SLR	24×36 mm	1971–1990	107	34
Start (Soviet SLR)	42.00 mm	SLR		1958–1964
Minolta SR-mount	43.50 mm	SLR	24×36 mm	1958–2001				6
Fujica X-mount	43.50 mm	SLR	24×36 mm	1980–1985
Pentaflex (16 mm cameras)	44.00 mm	cine
Canon EF-mount	44.00 mm	SLR	24×36 mm / APS-H / APS-C	1987–	47	64
Canon EF-S-mount	44.00 mm	SLR	APS-C	2003–	2	9	0	0
Praktica B-mount	44.40 mm	SLR	24×36 mm	1978–1990
Sigma SA-mount	44.00 mm	SLR	24×36 mm / APS-C	1992–	14	19	2	4
Arri LPL	44.00 mm	cine	25.54x36.70 mm	2018-					for Arri Alexa LF
Minolta/Konica Minolta/Sony A-mount	44.50 mm	SLR	24×36 mm	1985–	42+0+17	50+2+13	6+0+2	2+0+0
			APS-C	2004–	0+0+3	0+3+13	0+0+0	0+0+0
Rollei QBM	44.50 mm[12]	SLR	24×36 mm	1970–					Rollei, Voigtländer
Samsung Kenox mount	44.50 mm	SLR	24×36 mm	1997–2002	1	2 (3?)	0	0	Although designed in 1990s, mount is manual-focus only; lenses mount and lock on a slightly modified Minolta A-mount adapters
Exakta	44.7 mm[13]	SLR	24×36 mm	1936–1969
M39x1	45.20 mm[14]	SLR	24×36 mm	1952–1968					Early Russian SLRs (Zenit) (not to be confused with M39×26tpi and M39×1/28,8)
M37×1	45.46 mm	SLR	24×36 mm	1952-1957					Asahiflex I, Asahiflex IA (Tower 23), Asahiflex IIB (Tower 23/24), Asahiflex IIA (Tower 22)
M42×1	45.46 mm	SLR	24×36 mm	1949–					Pentacon, Pentax, Contax S, Praktica, Zeiss ZS, Zenit, many others (not to be confused with T-mount, which is M42×0.75)
Pentax K-mount	45.46 mm	SLR / Mirrorless	24×36 mm / APS-C	1975–	147[15]	108	8	3	Used also by some Samsung, Ricoh, Chinon, Agfa, Vivitar, Petri and KMZ (Zenit) cameras. Lens count only for Pentax-branded lenses.
Contax C/Y-mount	45.50 mm	SLR	24×36 mm	1974–2005	24	5	3		Used by some Contax and Yashica SLR cameras
Petri Bayonet	45.50 mm	SLR	24×36 mm						Petri SLRs 1960-77.
Mamiya Z	45.50 mm	SLR	24×36 mm	1980–
Kodak Retina DKL-mount	45.7 mm	SLR / Mirrorless	24×36 mm / 28×28 mm	1958–1977	12+6	0	0	0	DKL variants used by Retina Reflex S (034), Retina Reflex III (041), Retina Reflex IV (051, 051/N), Instamatic Reflex (062), Retina IIIS
Voigtländer Bessamatic DKL-mount	45.7 mm	SLR	24×36 mm	1958–1967