Camera Mounts Sorted by Register

Manual lens

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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


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  


M37×1 thread 45.46 37

Nikon 1

bayonet 17 40  


M39×26tpi 45.46 39


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    


bayonet 45.5 43

Micro Four Thirds

bayonet 19.25    


bayonet 45.5 48

Canon EX1/2 VL camcorder

bayonet 20    


breech lock 45.5  


breech 23.22    


breech mount 45.5  

Samsung NX

bayonet 25.5    

Olympus OM

bayonet 46 46

Pentax Auto 110

bayonet 27    


bayonet 46  

Leica M

bayonet 27.95 44  

Nikon F

bayonet 46.5 44

Konica Hexar RF

bayonet 28    

Leica R

bayonet 47 49


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  


bayonet 48  


38mm thread 28.8    

HDTV 2/3″

B4 bayonet 48  

Olympus Pen F

bayonet 28.95    


breech lock 48  

Contax G1

bayonet 29 44  


breech lock 50 46


M26×0.5 thread 31 26  


bayonet(?) 50.7 54


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  


bayonet 52  

Nikon rangefinder

bayonet 34.85 49  

Leica S

bayonet 53  

1/2″ video

bayonet 35.74    


breech lock 54 44.5


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


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  


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  


M41.2×26tpi 42.05    

Exakta 66

breech lock 74.1 60


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


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  


M39×26tpi 78.8  

Mamiya/Sekor CS

bayonet 43.5    

Kowa Six/Super 66

breech lock 79  


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


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


M39×1 thread 44    


M39×26tpi 92.3  

Sigma SA

inner bayonet 44    


bayonet 100  


bayonet 44.4    

Bronica S2A

bayonet & 57×1 thread 101.7 57


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


Recovered from [/nk_awb]