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 | Diameter is 50.00mm. User manual confirms. |
| Adaptall | bayonet(?) | 50.7 | Also Adapt-A-Matic, Adaptall 2 |
| Alpa | bayonet | 37.8 | |
| Altix | breech lock | 42.5 | Used on postwar 35mm cameras of VEB Altissa-Camera-Werk, Dresden. |
| Argus | bayonet | 44.45 | |
| Argus | 33mm thread | Used on C3 models | |
| Arriflex | bayonet | 52 | |
| Arri PL | breech lock | 52 | Diameter is 54.00mm |
| Arri Maxi PL | breech lock | 52 | Diameter is 64.00mm; otherwise similar to Arri PL. Used on Arriflex 765. |
| Asahiflex | bayonet | 45.46 |
| B4 | bayonet | 48 (air) | For 2/3″ 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 | bayonet | 69.0 ± 0.03 | Measured to back of body (mount surface for film back); see service manual |
| Bronica GS1 | bayonet |
| 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 | bayonet | 46 | No aperture ring on lenses; aperture set by control on body |
| Contax RF | dual bayonet | 34.85 | Measured to outside of outer bayonet; see this page. Most lenses mount to inner bayonet and have no focusing helical; focus is in camera body. Lenses mounting to the outer bayonet (usually longer lenses) have focusing capability. |
| Contax/Yashica | bayonet | 45.5 | |
| Contax G1 | bayonet | 29 | |
| Contax N | bayonet | 48 | Zeiss gives this figure. |
| Contax S | M42×1 thread | 45.5 | Identical to Pentax and Praktica; made by Carl Zeiss Jena after WW II. |
| D-mount | 0.625″×32tpi | 12.29 |
| Eclair | bayonet | 48 | |
| Exakta/Topcon | bayonet | 44.7 | The mechanism for automatic aperture stopdown is different on Exakta and Topcon. The Exakta provides a button over the release on the camera body so that the two are pressed simultaneously. Early Topcons had a similar mechanism, but most have a separate, concealed linkage. |
| Exakta 66 | breech lock | 74.1 | Identical to Pentacon 6 and Kiev 60. |
| Fujica X | bayonet | 43.5 | Used by the later Fujica 35mm SLRs, starting with the STX-1 about 1980. |
| Fujifilm XF | bayonet | 17.7 |
| 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” |
| Hasselblad H System | bayonet | 61.63 | from a Hasselblad publication. |
| Icarex | breech lock | 48 | 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 | Identical to Exakta 66 and Pentacon 6 |
| 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 S | bayonet | A good guess would be around 50mm, as the Hasselblad H adapter looks to be around 10mm. | |
| 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 | Used by Contax S, Pentax, Praktica, and many Yashica, Chinon, Cosina, Ricoh, and Soviet cameras. |
| Mamiya 7/7II | bayonet | ∼60 | Diameter is 49mm, according to this measurement. |
| Mamiya 645 | bayonet | 63.3 | |
| Mamiya RB | bayonet | 112.00 | 111.00 according to this message on pentaxforums.com. |
| Mamiya RZ | bayonet | 105.00 | 108.00 according to this message on pentaxforums.com. |
| Mamiya ZE | bayonet | 45.5 | |
| Micro Four Thirds | bayonet | 19.25 | |
| 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. Apparently the M44 thread originated in the first Miranda of 1954, and was retained for compatibility when a new bayonet was introduced. Starting in 1974, the "TM" models used M42, and a Miranda-branded K-mount SLR was sold in the U.K. |
| Mitchell BNCR | breech lock | 61.468 |
| Narcissus | M24x1 thread | 28.8 | |
| Nikon 1 | bayonet | 17 | |
| 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 |
|---|
| Panavision PV | breech lock | 57.15 | Diameter is 49.50mm |
| Paxette | M39x1 thread | 44 | |
| Pentacon 6 | breech lock | 74.1 | Identical to Exakta 66 and Kiev 60. |
| Pentax 6x7 | bayonet | 84.95 | (74.10?) |
| Pentax 645 | bayonet | 70.87 | |
| Pentax Auto 110 | bayonet | 27 | |
| Pentax/Praktica | M42x1 thread | 45.46 | add film thickness, and get 45.50mm... |
| Pentax K | bayonet | 45.46 | Register identical to Pentax M42 mount |
| Pentax Q | bayonet | 9.2 | |
| Pentina | breech lock | 45.5 | |
| Praktica | bayonet | 44.4 | |
| Praktiflex | M40x1 thread | 44.0 | |
| 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 another list that has since disappeared from the Web, 44.46 according to Wikipedia |
| Rolleiflex SL66 | bayonet | 102.8 | according to this message on pentaxforums.com. |
| Rolleiflex SLX | bayonet | 74.00 |
| Samsung NX | bayonet | 25.50 | |
| 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. |
| Sony E | bayonet | 18 |
| T2 mount | M42x0.75 | 55 | Also T-mount, Sigma YS. T stands for "Tamron". |
| Topcon IC1 | bayonet | 55 | |
| Topcon RE | bayonet | 44.7 | Identical to Exakta |
| 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 | 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 |