This is basically a reformatting of the wonderful list published by William-Jan Markerink. See also this list. There is also a wonderful page with photographs of different mounts.
I have made the following changes:The same list is available sorted in order of register distance here.
| Camera System | Mount type | Register | Comments |
|---|
| 4/3 System digital | bayonet | 38.58 | Designed by Olympus, this mount is apparently mechanically identical to the Olympus OM mount, but with a smaller register. An OM-to-4/3 adapter is just an extension tube. |
| Aaton | bayonet(?) | 40 | |
| Alpa | bayonet | 37.8 | |
| Argus | bayonet | 44.45 | |
| Arriflex | bayonet | 52 |
| B4 | bayonet | 48 (air) | For 2/3&Prime video, both normal and HDTV. Mentioned here. A technical report from Sandia National Labs agrees. |
| Bolex | breech | 23.22 | |
| Bolex H8RX | 1″×32tpi thread | 15.31 | |
| Bronica S2A | bayonet & 57x1 thread | 101.7 | |
| Bronica ETRS | |||
| Bronica GS1 |
| C-mount | 1″×32tpi thread | 17.526 | (0.69″) |
| C-S mount | 1″×32tpi thread | 12.526 | According to Navitar, who should know. Thread is also known as “1-32 UN 2A.” |
| Canon EOS | bayonet | 44 | |
| Canon EX1/2 VL camcorder | bayonet | 20 | |
| Canon R/FL/FD | breech or bayonet | 42 | 42.1mm according to this list, 42.00mm according to Wikipedia, 42.13mm according to a Japanese list that seems to have vanished from the Web. The Canon service manuals of the time specify a “42.14 Dial Gauge”, whatever that might be, to adjust the flange distance |
| Canon screw | M39x1 thread | 28.8 | |
| Contarex | 46 | ||
| Contax RF | 34.85 | 31.76mm or 31.95mm according to this page. | |
| Contax/Yashica | bayonet | 45.5 | |
| Contax G1 | bayonet | 29 | |
| Contax N | bayonet | 48 | Zeiss gives this figure. |
| D-mount | 0.625″×32tpi | 12.29 |
| Exakta/Topcon | bayonet | 44.7 | |
| Exacta 66 | breech lock | 74.1 | |
| Eclair | bayonet | 48 |
| HDTV 2/3″ | B4 bayonet | 48 (air) | Mentioned here. A technical report from Sandia National Labs agrees. |
| Hasselblad/Kiev88 | multi start thread | 82.1 | |
| Hasselblad 500/2000 | bayonet | 74.9 | |
| Hasselblad Xpan | bayonet | 34.27 mm, +/- 0.03 mm | courtesy of Hasselblad UK, via Huw Finney and an alert reader whose name I have only as “David” |
| Icarex | breech lock | 48 | 44.7 according to this list; Icarex35 TM, 35S TM, SL706 use M42 mount. |
| Camera System | Mount type | Register | Comments |
|---|
| K-mount | bayonet | 45.46 | |
| Kilarflex | 92.3 | ||
| Kilarscope | 78.8 | ||
| Kiev 60/Kiev Six | breech lock | 74.1 | |
| Kiev 88 | multi start thread | 82.1 | |
| Kodak Retina Reflex | bayonet | 44.7? | Used by Retina Reflex S, III, and IV, and even the Retina IIIs rangefinder; a slightly modified version of the Deckel bayonet used on the Voigtländer Bessamatic. |
| Konica Autoreflex | bayonet | 40.5 | According to this page and this one. Markerink’s original list had it as 40.7. |
| Konica F | bayonet | 40.5 | |
| Konica Hexar RF | bayonet | 28.00mm ± 0.03mm (pressure plate rails) 27.76mm (film rails) |
Designed for compatibility with Leica M lenses, but nominal distances are slightly different. |
| Kowa Six/Super 66 | breech lock | 79 |
| Leica M | bayonet | 27.95 | Measured to pressure-plate rails. 27.76 to film rails. See this page for a discussion of the subtleties. |
| Leica R | bayonet | 47 | |
| Leica screw | M39x26tpi | 28.8 | This and the Visoflex mount are sometimes mistaken for M39×1mm, a tiny difference, but enough to cause problems with some non-Leica M39 lenses. |
| Leitz Visoflex I | M39x26tpi | 62.5 | (91.30 total) |
| Leitz Visoflex II, III | Leica M bayonet | 40 | (68.80 total) |
| M42 screw | M42x1 thread | 45.46 | |
| Mamiya 645 | bayonet | 63.3 | |
| Mamiya RB | bayonet | 112.00 | |
| Mamiya RZ | bayonet | 105.00 | |
| Minolta AF | bayonet | 44.6 | variously listed elsewhere as 44.5, 44.6, 44.7; Konica/Minolta’s digital SLRs were taken over by Sony, who uses the same mount. |
| Minolta MD | bayonet | 43.72 +0.01 -0.02 | Measured (I think) to pressure plate rails: see
this service manual for specifics. 43.7 +0.02, -0 according to this page. |
| Miranda dual bayonet/screw | 4-claw bayonet and 44×1mm screw mount | 41.5 | 41.46 according to this list and this one. |
| Narcissus | M24x1 thread | 28.8 | |
| Nikon F | bayonet | 46.5 | |
| Nikon rangefinder | bayonet | 34.85 | Identical to Contax mount, but with slightly different focusing cam. |
| Novoflex | 100 |
| Olympus OM | bayonet | 46 | |
| Olympus Pen F | bayonet | 28.95 |
| Camera System | Mount type | Register | Comments |
|---|
| Paxette | M39x1 thread | 44 | |
| Pentacon 6 | breech lock | 74.1 | |
| Pentax 6x7 | bayonet | 84.95 | (74.10?) |
| Pentax 645 | bayonet | 70.87 | |
| Pentax/Practica | M42x1 thread | 45.46 | add film thickness, and get 45.50mm... |
| Practica | bayonet | ||
| Practiflex | M40x1 thread | 45.50(?) | |
| Petriflex | breech lock | 43.5 | |
| Petri | bayonet | 45.5 | from this list |
| Praktica | bayonet | 44.4 | |
| Praktina | breech lock | 50 |
| Rectaflex | 43.4 | ||
| Ricoh | breech mount | 45.5 | |
| Rolleiflex SL35 | bayonet | 44.6 | (44.5mm according to Schneider), 44.7 according to this list |
| Rolleiflex SL66 | bayonet | 102.8 |
| Schneider | M26x0.5 | ||
| Sigma SA | inner bayonet | 44 | Similar to Pentax K, but incompatible. Rumor from China has the Sigma mount using the same electrical signals as the Canon EOS mount, with which it shares a register of 44.0 mm. |
| Sony Alpha | bayonet | 44.6 | Variously listed elsewhere as 44.5, 44.6, 44.7; identical to Minolta AF mount. |
| T2 mount | M42x0.75 | 55 | |
| Topcon IC1 | bayonet | 55 |
| Voigtländer Bessamatic | bayonet | 44.7 | This is a leaf-shutter camera, but apparently designed with the shutter behind the lens, so the entire lens can be removed and used elsewhere. Someone will sell you an M42 adapter for this mount. The Bessamatic mount is so similar to that of the Kodak Retina Reflex that apparently it is possible to modify a lens to fit both cameras. |
| Yashica Pentamatic, Pentamatic II | bayonet | 43.00 (from this page) | This mount predates the M42-mount Yashica SLR’s, which were introduced in 1962. Judging by the photos of Exakta and M42 adapters found in the manual, the register is significantly less than the 45.46mm of the M42 mount. Not to be confused with the shared Contax/Yashica bayonet mount, which has a register similar to that of the M42 mount. |
| Wrayflex | M41.2×26tpi | 42.05 |
| Zeiss Ikon Flektoskop, Flektometer | 84.5 | (119.35 total) | |
| Zeiss Ikon Panflex | 64.5 | (99.35 total) | |
| Zenith 3M | M39x1 thread | 45.46 | |
| Zenit 80 | multi start thread | 74.1 |