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Camera Mounts Sorted by Register

This is a list of known camera mounts (thanks to William-Jan Markerink, who provided almost all the data in this table. I have sorted the mounts in order of decreasing register (flange distance) to help see what adaptations might be feasible with correct infinity focus. Generally speaking, a lens might be adapted to bodies farther down the list; moving upward means that a simple adapter (one with no optical elements) is impossible for an unmodified camera and lens while retaining infinity focus. Where the distances are the same, or very close, things might or might not work.

For example, adapting a Leica R mount lens (distance 47mm) to a Nikon F mount (distance 46.5mm) leaves only 0.5mm space, which might be too thin to make a usable adapter. Close cases also require that the thread or bayonet of the lens must be small enough to fit entirely inside the mount of the body, and this list gives no information. That said, there are examples where an adapter between two mounts of exactly the same distance is possible, notably the Pentax K, for which Pentax M42 adapters are readily available. Presumably Pentax designed the K mount with this in mind. Where no adapter is possible, it is sometimes possible to modify a camera body with a mounting flange from some other system; look here for an example. Note that this isn’t a cheap option unless you are a Leica owner. Of course, we can also modify the lens.

Where the distances are widely different, e.g. when adapting most medium-format lenses to most 35mm bodies, an adapter is usually feasible. Some manufacturers even encourage this, e.g. Pentax and Contax. More modern cameras make things much more complicated with proprietary electronic lens/body connections for aperture control, autofocus, etc; even after buying or making a mechanical adapter, many features of the lens just won’t work.

Most lens mount conversions sacrifice autofocus, automatic exposure, or both. In some cases, even the camera’s light-metering and focus confirm are crippled. One exception is Canon and Sigma SA mounts; apparently the electronic protocols reportedly match, and the lens register seems to be identical.

Someone in China has apparently converted a Canon L-series lens to work on his Sigma digital SLR; there is a discussion of the relevant issues in this forum. A more challenging approach is to build circuitry to translate between camera and lens; this is done in a somewhat pricey conversion of Contax N lenses for modern cameras with automatic features supported. I have tried to code each entry by color corresponding to the original image format:

35mm full-frame is yellow

Smaller formats are blue

Larger formats are green

Cinema and video formats are white

The same list is available in alphabetical order here.

Camera System	Mount Type	Register	Diameter		Camera System	Mount Type	Register	Diameter
Pentax Q	bayonet	9.2			Voigtländer Bessamatic	bayonet	44.7	38
D-mount	0.625″×32tpi	12.29	15.88		Exakta/Topcon RE	bayonet	44.7	46
C-S mount	1″×32tpi thread	12.526	25.4		Voigtländer Vitessa T	bayonet	44.7
Bolex H8RX	1″×32tpi thread	15.31	25.4		Asahiflex	M37×1 thread	45.46	37
Nikon 1	bayonet	17	40		ZM39	M39×26tpi	45.46	39
C-mount	1″×32tpi thread	17.526	25.4		M42: Pentax, Praktica, Contax S, …	M42×1 thread	45.46	42
Fujifilm X	bayonet	17.7			Pentax K	bayonet	45.46	44
Sony E	bayonet	18			Petri	bayonet	45.5	43
Micro Four Thirds	bayonet	19.25			Contax/Yashica	bayonet	45.5	48
Canon EX1/2 VL camcorder	bayonet	20			Pentina	breech lock	45.5
Bolex	breech	23.22			Ricoh	breech mount	45.5
Samsung NX	bayonet	25.5			Olympus OM	bayonet	46	46
Pentax Auto 110	bayonet	27			Contarex	bayonet	46
Leica M	bayonet	27.95	44		Nikon F	bayonet	46.5	44
Konica Hexar RF	bayonet	28			Leica R	bayonet	47	49
Narcissus	M24×1 thread	28.8	24		Éclair CA-1	bayonet	48	46
Canon screw	M39×1 thread	28.8	39		Contax N	bayonet	48	55
Leica screw	M39×26tpi	28.8	39		B4	bayonet	48
Opema	38mm thread	28.8			HDTV 2/3″	B4 bayonet	48
Olympus Pen F	bayonet	28.95			Icarex	breech lock	48
Contax G1	bayonet	29	44		Praktina	breech lock	50	46
Robot	M26×0.5 thread	31	26		Adaptall	bayonet(?)	50.7	54
Robot	bayonet	31			Arri Maxi PL	breech lock	52	64
Hasselblad Xpan	bayonet	34.27	46		Arri PL	breech lock	52	64
Contax RF	dual bayonet	34.85	44		Arriflex	bayonet	52
Nikon rangefinder	bayonet	34.85	49		Leica S	bayonet	53
1/2″ video	bayonet	35.74			Werra	breech lock	54	44.5
Alpa	bayonet	37.8	42		T2 mount	M42×0.75	55	42
Sony 1/2″ Video	bayonet	38			Topcon UV	bayonet	55
Minolta V	bayonet	38			Panavision PV	breech lock	57.15	49.5
4/3 System digital	bayonet	38.58	44		Mamiya 7/7II	bayonet	59	49
Argus	38mm thread	39	38		Mitchell BNCR	breech lock	61.468	68
Leitz Visoflex II, III	Leica M bayonet	40	44		Hasselblad H System	bayonet	61.63
Aaton PL-40	breech lock	40	50		Leitz Visoflex I	M39×26tpi	62.5	39
Konica Autoreflex	bayonet	40.5	47		Mamiya 645	bayonet	63.3	62
Konica F	bayonet	40.5			Zeiss Ikon Panflex	bayonet	64.5
Miranda dual bayonet/screw	4-claw bayonet and 44×1mm screw mount	41.5			Bronica ETRS	bayonet	69
Argus	33mm thread	41.9	33		Pentax 645	bayonet	70.87	61.2
Canon R/FL/FD	breech or bayonet	42	48		Rolleiflex SLX	bayonet	74
Wrayflex	M41.2×26tpi	42.05			Exakta 66	breech lock	74.1	60
Altix	breech lock	42.5	34		Kiev 60/Kiev Six	breech lock	74.1	60
Yashica Pentamatic, Pentamatic II	bayonet	43	47		Pentacon 6	breech lock	74.1	60
Rectaflex	bayonet	43.4			Hasselblad 500/2000	bayonet	74.9	69
Fujica X	bayonet	43.5	49		Reflex Korelle	40.5 × 0.75 thread	77.5	40.5
Mamiya/Sekor E	bayonet	43.5	49		Kilarscope	M39×26tpi	78.8
Mamiya/Sekor CS	bayonet	43.5			Kowa Six/Super 66	breech lock	79
Petriflex	breech lock	43.5			Hasselblad 1000F/1600F	multi start thread	82.1	78
Minolta SR/MC/MD	bayonet	43.72	41		Kiev 88, Salut, Zenit 80	multi start thread	82.1	78
Praktiflex	M40×1 thread	44	40		Zeiss Ikon Flektoskop, Flektometer	screw	84.5
Canon EOS	bayonet	44	54		Pentax 6×7	bayonet	84.95	72
Kiev 10,15	bayonet	44	42?		Bronica SQ	bayonet	85	78
Paxette	M39×1 thread	44			Kilarflex	M39×26tpi	92.3
Sigma SA	inner bayonet	44			Novoflex	bayonet	100
Praktica	bayonet	44.4			Bronica S2A	bayonet & 57×1 thread	101.7	57
Argus	bayonet	44.45			Rolleiflex SL66	bayonet	102.8
Minolta AF/Sony Alpha	bayonet	44.5	49.7		Mamiya RZ	bayonet	105	60
Rolleiflex SL35 (QBM)	bayonet	44.6	49.7		Mamiya RB	bayonet	112	60
Kodak Retina Reflex	bayonet	44.7	38		Bronica GS1	bayonet

Recovered from Archive.org [/nk_awb]