A lens mount is an interface – mechanical and often also electrical – between a photographic camera body and a lens. It is a feature of camera systems where the body allows interchangeable lenses, most usually the rangefinder camera, single lens reflex type, single lens mirrorless type or any movie camera of 16 mm or higher gauge. Lens mounts are also used to connect optical components in instrumentation that may not involve a camera, such as the modular components used in optical laboratory prototyping which join via C-mount or T-mount elements.
Male mount of Minolta MC-Rokkor 58mm 1:1.4 lens with female lens mount of an Minolta XD-7
A lens mount may be a screw-threaded type, a bayonet-type, or a breech-lock (friction lock) type. Modern still camera lens mounts are of the bayonet type, because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body. Screw-threaded mounts are fragile and do not align the lens in a reliable rotational position, yet types such as the C-mount interface are still widely in use for other applications like video cameras and optical instrumentation.
Bayonet mounts generally have a number of tabs (often three) around the base of the lens, which fit into appropriately sized recesses in the lens mounting plate on the front of the camera. The tabs are often "keyed" in some way to ensure that the lens is only inserted in one orientation, often by making one tab a different size. Once inserted the lens is fastened by turning it a small amount. It is then locked in place by a spring-loaded pin, which can be operated to remove the lens.
Lens mounts of competing manufacturers (Sony, Nikon, Canon, Contax/Yashica, Pentax, etc.) are almost always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance from the lens mount to the film or sensor can also be different. Many[who?] allege that these incompatibilities are due to the desire of manufacturers to "lock in" consumers to their brand.[citation needed]
In movie cameras, the two most popular mounts in current usage on professional digital cinematography cameras are Arri's PL-mount and Panavision's PV-mount. The PL-Mount is used both on Arri and RED digital cinematography cameras, which as of 2012[update] are the most used cameras for films shot in digital. The Panavision mounts are exclusively used with Panavision lenses, and thus are only available on Panaflex cameras or third-party cameras "Panavised" by a Panavision rental house, whereas the PL-mount style is favored with most other cameras and cine lens manufacturers. Both of these mounts are held in place with locating pins and friction locking rings. Other mounts which are now largely historical or a minority in relation to current practices are listed below.
Canon EOS R series full-frame and APS-C mirrorless cameras; lenses designated as RF-S are optimized for APS-C sensors, but will mount on full-frame bodies
For small camera modules, used in e.g. CCTV systems and machine vision, a range of metric thread mounts exists. The smallest ones can be found also in e.g. cellphones and endoscopes. The most common by far is the M12x0.5, followed by M8x0.5 and M10x0.5.[10]
So some manufacturers (e.g. Linhof) offered special focusing lens mounts, so-called wide-angle focusing accessories for their cameras. With such a device, the lens could be focused precisely without moving the entire front standard.
Secondary lens mount
A teleconverter attached between a camera and its objective
Secondary lens refers to a multi-element lens mounted either in front of a camera's primary lens, or in between the camera body and the primary lens.
(D)SLR camera & interchangeable-lens manufacturers offer lens accessories like extension tubes and secondary lenses like teleconverters, which mount in between the camera body and the primary lens, both using and providing a primary lens mount. Various lensmakers also offer optical accessories that mount in front of the lens; these may include wide-angle, telephoto, fisheye, and close-up or macro adapters.
Canon PowerShot A and Canon PowerShot G cameras have a built-in or non-interchangeable primary (zoom) lens, and Canon has "conversion tube" accessories available for some Canon PowerShot camera models which provide either a 52mm or 58mm "accessory/filter" screw thread. Canon's close-up, wide- (WC-DC), and tele-conversion (TC-DC) lenses have 2, 3, and 4-element lenses respectively, so they are multi-element lenses and not diopter "filters".
Lens mount adapters
This lens adapter is a passive adapter designed for mounting a Nikon F mount lens to a Micro Four Thirds camera.
Lens mount adapters are designed to attach a lens to a camera body with non-matching mounts. Generally, a lens can be easily adapted to a camera body with a smaller flange focal distance by simply adding space between the camera and the lens. When attempting to adapt a lens to a camera body with a larger flange focal distance, the adapter must include a secondary lens in order to compensate. This has the side effect of decreasing the amount of light that reaches the sensor, as well as adding a crop factor to the lens. Without the secondary lens, these adapters will function as an extension tube and will not be able to focus to infinity.[11]
^A: The authoritative normative source for 4/3 standards information is Four-Thirds.Org and not 3rd-party reviews.
4/3's published facts:
"Size of the 4/3-type Sensor: The standard diagonal length of the sensor is 21.63 millimetres (0.852 in). It is half that of 35-mm film format (36 millimetres (1.4 in) x 24 millimetres (0.94 in) = 43.27 millimetres (1.704 in)) The image circle of the interchangeable lens is specified based on this diagonal length. The focal length is about a half that of a 135 film camera lens assuming the same angle of view."[12]
"The foundation for the high picture quality of the Four Thirds system is the lens mount, which is about twice the diameter of the image circle."[13]
"Differences between Four Thirds System mount and Micro Four Thirds System mount: Mount diameter reduction; As a result of research aimed at facilitating the design of compact, lightweight lenses while maintaining the current strength, the outer diameter of the lens mount has been reduced by approx. 6 millimetres (0.24 in). ... the Micro Four Thirds System ... specifies the optimum flange back length required to reduce camera size and thickness, assuming the omission of the mirror box. The flange back length has been reduced to about 1/2 that of the Four Thirds System."[14]
So:
21.63mm * 2 = 43.26 millimetres (1.703 in) or ~44mm
43.26mm – 6mm = 37.26 millimetres (1.467 in) or ~38mm
NOTE: Some published reviews of 4/3 instead cite the (female) "outside diameter" of the lens or mount as ~50mm (and micro-4/3 as ~44mm),[15] and not the appropriate major diameter (D) ~44mm which is the camera body's female mount inside-diameter and the lens's male mount outside-diameter (micro-4/3 ~38mm).
References
^. Canon. Archived from the original on 2008-07-24. Retrieved 2008-07-22.
^"Debut of Nikon F". Nikon. from the original on 2020-08-12. Retrieved 2020-10-26.
^Hornberg, Alexander (2007-02-27). Handbook of Machine Vision. John Wiley & Sons. ISBN9783527610143.
^The M42 (Praktica) mount is sometimes referred to as a "P" thread. See, e.g., "Questar Corporation: Photographic Camera Adapters "P" Thread". Retrieved 2017-03-01.
^"cctvopticallens-m12 and cs mount lens provider". www.cctvopticallens.com. Retrieved 3 April 2018.
^"Lens mount compatibility chart". Retrieved 2016-11-29.
^. Four Thirds System. Archived from the original on 2009-03-07. Retrieved 2008-08-11.
^"About Four Thirds, Standard, Benefits of Four Thirds". Four Thirds System. Retrieved 2008-08-11.
^"Micro Four Thirds, Standard, Whitepaper (Summary of Standard)". Four Thirds System. Retrieved 2008-08-11.
^"Olympus and Panasonic announce Micro Four Thirds". Digital Photography Review.
Sources
Markerink, Willem-Jan. . Archived from the original on 2007-11-24. Retrieved 2007-09-20.
External links
SLR Mount Identification Guide
, Camera mounts & registers from Robert Monahan Medium Format Photography Megasite
http://www.markerink.org/WJM/HTML/mounts.htm, Camera mounts & registers from Willem-Jan Markerink
Camera Mounts Sorted by Register
Alphabetical List of Camera Mounts
Adaptall-2.com
DPreview Hands-on preview of Canon EOS M
Standard: GOST 10332-72 (in Russian) – M42×1/45.5, M39×1/28.8
Standard: GOST 10332-63 (in Russian) – M39×1/45.2 (aka «Z39»), M39×1/28.8, bayonet «C» (cameras: «Zenit-5», «Zenit-6», «Zenit-7»), bayonet «Zenit-7» (in Russian)
April 04, 2023
lens, mount, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, 2016, learn, w. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Lens mount news newspapers books scholar JSTOR May 2016 Learn how and when to remove this template message A lens mount is an interface mechanical and often also electrical between a photographic camera body and a lens It is a feature of camera systems where the body allows interchangeable lenses most usually the rangefinder camera single lens reflex type single lens mirrorless type or any movie camera of 16 mm or higher gauge Lens mounts are also used to connect optical components in instrumentation that may not involve a camera such as the modular components used in optical laboratory prototyping which join via C mount or T mount elements Male mount of Minolta MC Rokkor 58mm 1 1 4 lens with female lens mount of an Minolta XD 7 Lenses sold per year by mount type Contents 1 Mount types 2 List of lens mounts 3 Focusing lens mount 4 Secondary lens mount 5 Lens mount adapters 6 See also 7 Notes 8 References 8 1 Sources 9 External linksMount types EditA lens mount may be a screw threaded type a bayonet type or a breech lock friction lock type Modern still camera lens mounts are of the bayonet type because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body Screw threaded mounts are fragile and do not align the lens in a reliable rotational position yet types such as the C mount interface are still widely in use for other applications like video cameras and optical instrumentation Bayonet mounts generally have a number of tabs often three around the base of the lens which fit into appropriately sized recesses in the lens mounting plate on the front of the camera The tabs are often keyed in some way to ensure that the lens is only inserted in one orientation often by making one tab a different size Once inserted the lens is fastened by turning it a small amount It is then locked in place by a spring loaded pin which can be operated to remove the lens Lens mounts of competing manufacturers Sony Nikon Canon Contax Yashica Pentax etc are almost always incompatible In addition to the mechanical and electrical interface variations the flange focal distance from the lens mount to the film or sensor can also be different Many who allege that these incompatibilities are due to the desire of manufacturers to lock in consumers to their brand citation needed In movie cameras the two most popular mounts in current usage on professional digital cinematography cameras are Arri s PL mount and Panavision s PV mount The PL Mount is used both on Arri and RED digital cinematography cameras which as of 2012 update are the most used cameras for films shot in digital The Panavision mounts are exclusively used with Panavision lenses and thus are only available on Panaflex cameras or third party cameras Panavised by a Panavision rental house whereas the PL mount style is favored with most other cameras and cine lens manufacturers Both of these mounts are held in place with locating pins and friction locking rings Other mounts which are now largely historical or a minority in relation to current practices are listed below List of lens mounts EditMount name Flange focal distance Frame size Throat or thread diameter Mount thread pitch Mount type Primary use Camera linesCanon SV 32 00 mm Bayonet Photography Digital Canon RC 701 amp 760Argus C3 40 3 mm 35 mm 34 mm 20 TPI Screw Photography Argus C3Canon EX 20 mm 1 2 Bayonet PhotographyCanon FL 42 mm 35 mm 48 mm Breech lock Photography Canon FD 42 mm 35 mm 48 mm Breech lock Photography Canon F series A series and T series SLRsCanon FDn a k a New FD 42 mm 35 mm 48 mm Bayonet Photography completely interchangeable with earlier FD lensesCanon EF 44 00 mm 35 mm 54 mm 1 Bayonet Photography Canon EOS 35mm film SLR Full Frame amp APS H DSLRCanon EF S 44 00 mm APS C 54 mm Bayonet Photography Digital Canon EOS APS C DSLRCanon EF M 18 mm APS C 47 mm Bayonet Photography Digital Canon EOS M series Mirrorless APS C CamerasCanon RF 20 mm 35 mm and APS C 54 mm Bayonet Photography Digital Canon EOS R series full frame and APS C mirrorless cameras lenses designated as RF S are optimized for APS C sensors but will mount on full frame bodiesNikon S 34 85 mm 35 mm 49 mm Bayonet Photography Nikon RangefinderNikon F 46 5 mm 35 mm 44 mm 2 Bayonet Photography Nikon F 35mm film SLR Full Frame amp APS C DSLRNikon 1 17 mm 13 2 x 8 8mm 40 mm Bayonet Photography Digital Nikon 1 seriesNikon Z 16 mm 35 mm 55 mm Bayonet Photography Digital Nikon Z Mirrorless Full Frame amp APS CSony Mavica 57 mm Bayonet Photography Digital Sony E FE 18 mm 35 mm and APS C 46 1 mm 1 815 inch Bayonet Photography Digital Sony E FE Mount Alpha Mirrorless Full Frame APS C Sony NEX Mirrorless APS CMinolta SR 43 50 mm 35 mm 44 97 mm Bayonet 54 Photography Minolta SR MC MDMinolta V 38 00 mm APS H 39 7 mm Bayonet Photography Minolta VectisMinolta A 44 50 mm 35 mm and APS C 49 7 mm 1 939 inch Bayonet 54 Photography Minolta DSLR AF Alpha Dynax MaxxumSony DSLR Alpha a A MountPentax Auto 110 27 mm 110 film 19 5 mm Bayonet Photography Pentax Auto 110 and Auto 110 SuperPentax Q 9 2 mm 1 2 3 1 1 7 31 mm Bayonet Photography Digital Pentax K 45 46 mm 35 mm and APS C 44 mm Bayonet Photography Used also by Ricoh Chinon Agfa Vivitar and KMZ Zenit camerasLeitz Visoflex I 91 3 mm 35 mm M39 26 TPI Screw PhotographyLeitz Visoflex II III 67 8 mm 35 mm 44 mm Bayonet Leica M PhotographyLeica M 27 80 mm 35 mm 44 mm Bayonet Photography Leica M seriesLeica CLMinolta CLELeica R 47 00 mm 35 mm 49 mm Bayonet PhotographyLeica L 20 mm 35 mm and APS C 51 6 mm Bayonet Photography Digital L Mount Alliance Leica Panasonic and Sigma Mirrorless Contax RF 34 85 mm 35 mm 44 mm Double bayonet Photography Contax I II III IIa IIIaKiev rangefindersContax G 29 00 mm 35 mm 44 mm Breech lock PhotographyContax N 48 mm 35 mm 55 mm Bayonet PhotographyContax Yashica 45 5 mm 35 mm 48 mm Bayonet Photography Yashica ContaxYashica MA 45 8 mm 35 mm Bayonet Photography Kyocera Yashica 230 AF etc Fujica X 43 5 mm 35 mm 49 mm Bayonet Photography Fujica XFujifilm X 17 7 mm APS C 44 mm Bayonet Photography Digital Fujifilm X series mirrorlessOlympus Pen F 28 95 mm 35 mm half frame Bayonet PhotographyOlympus OM 46 mm 35 mm 46 mm Bayonet PhotographyFour Thirds 38 67 mm 17 3 mm 12 98 mm 44 mm A Bayonet Photography Digital Olympus EPanasonic Lumix DMC LLeica DigiluxMicro Four Thirds 19 25 mm 17 3 mm 12 98 mm 38 mm A Bayonet Photography Digital Olympus Pen amp OM D seriesPanasonic G GF GX amp GH SeriesBlackmagic Design Cinema CameraKM 28 mm 27 80 mm 35 mm 44 mm Bayonet Photography Konica Hexar RFKonica F 40 50 mm 35 mm 40 mm Bayonet Photography Konica FKonica AR 40 50 mm 35 mm 47 mm Bayonet Photography Konica AutoreflexSamsung NX mini 6 95 mm 1 38 mm Bayonet photography Digital Samsung NX 25 5 mm APS C 42 mm Bayonet Photography Digital Samsung Kenox 44 5 mm 35 mm Bayonet Photography Manual focus only there is only one compatible camera Samsung Kenox GX 1 Samsung SR4000 Icarex BM 48 00 mm 35 mm mm Breech lock Photography Icarex 35SD 12 29 mm 8 mm 15 88 mm 0 625 inch 32 TPI Screw Cinematography CS 12 52 6 mm 3 1 3 1 2 25 40 mm 1 inch 32 TPI Screw Cinematography Industrial C 17 526 mm 0 69 inches 1 2 16 mm 2 3 1 25 40 mm 1 inch 32 TPI Screw Cinematography Industrial Machine Vision S a k a M12 No Flange Back focal distance from lt 1mm to 12mm 1 6 to 1 12 mm 0 5 mm pitch Screw CCTV PCB Edmund Optics m VideoBolex Bajonet 23 22 mm 16 mm Breech lock Cinematography effective focal distance 17 526 mm 0 69 inches due to beam splitter behind mount flange accepts C mount lenses with adapter 1 3 bayonet mount 25 mm 1 3 5 24 x2 94 Bayonet Video JVC professional video camerasM39 a k a L Mount LTM 28 80 mm 35 mm M39 26 TPI Screw Photography Leica M39 screw mountNarciss 28 8 mm 16 mm M24 1 mm Screw Photography1 2 bayonet mount 37 80 mm 1 2 6 97 x3 92 Bayonet Video Non Sony professional video camerasAlpa 37 80 mm 35 mm 42 mm Bayonet PhotographySony 1 2 Video 38 mm 1 2 6 97 x3 92 Bayonet Video Sony professional video camerasAaton universal 40 mm 16 mm 50 mm Breech lock CinematographyMiranda bayonet M44 41 5 mm 35 mm and APS C Bayonet Photography Miranda Camera CompanyPetriflex 43 5 mm 35 mm Breech lock PhotographySigma SA 44 00 mm 35 mm 44 mm Bayonet Photography Sigma SAPaxette 44 mm 35 mm M39 1 mm Screw PhotographyPraktiflex 44 mm 35 mm M40 1 mm Screw PhotographyPraktica 44 40 mm 35 mm 42 mm Bayonet PhotographyExakta Topcon RE 44 7 mm 35 mm 46 mm Bayonet PhotographyZenit M39 45 2 mm 35 mm M39 1 mm Screw PhotographyM37 45 46 mm 35 mm 37 mm 1 mm Screw Photography AsahiflexM42 45 46 mm 35 mm 42 mm 1 mm Screw Photography Praktica 4 Pentax ZenitB4 mount 48 mm 2 3 9 6 x5 4 Bayonet Video Professional and broadcast video camerasPraktina 50 mm 35 mm 46 mm Breech lock PhotographyT Thread Very earliest type 50 7 mm 35 mm M37 0 75mm Screw Photography TamronAdapt A Matic 50 7 mm 35 mm 54 mm Bayonet Photography TamronAdaptall amp Adaptall 2 50 7 mm 35 mm 54 mm Bayonet Photography TamronArri standard 52 mm 35 mm and 16 mm 64 mm Tab lock CinematographyArri bayonet 52 mm 35 mm and 16 mm 64 mm Bayonet CinematographyArri PL 52 mm 35 mm and 16 mm 54 mm Breech lock CinematographyArri LPL 44 mm Arri LF 62 mm Breech lock CinematographyArri Maxi PL 52 mm 70 mm 64 mm CinematographyT 55 mm 35 mm 42 mm 0 75 mm Screw Photography TamronYS Auto T Thread 55 mm 35 mm 42 mm 0 75 mm Screw Photography Sigma CorporationT thread 55 mm 35 mm 47 mm 0 75 mm Screw Photography TokinaH Mount 55 mm 35 mm 47 mm 0 75 mm Screw Photography Hanimex rebranding of Tokina M47 Panavision PV 57 15 mm 35 mm 49 5 mm Breech lock CinematographyB3 mount 58 mm 2 3 Reverse bayonet Video IkegamiMitchell BNCR 61 468 mm 35 mm 68 mm Breech lock Cinematography Zeiss Panflex 5522 23 for Contax RF 64 50 mm 35 mm Double bayonet PhotographyKowa Six Super 66 79 mm 6 6 Breech lock PhotographyHasselblad 74 9 mm 6 6 69 mm Bayonet PhotographyHasselblad Xpan 34 27 mm 35 mm panoramic 46 mm Bayonet PhotographyBronica ETR 85 mm 6 4 5 mm Bayonet PhotographyBronica RF mm 6 4 5 mm Bayonet PhotographyBronica SQA 101 7 mm 6 6 57 mm Bayonet PhotographyBronica GS1 85 mm 6 7 80 5 mm Bayonet PhotographyMamiya 645 63 3 mm 6 4 5 62 mm Bayonet PhotographyMamiya 6 56 2 mm approx 5 6 6 mm Bayonet PhotographyMamiya 7 7II 59 mm approx 6 7 49 mm 6 Bayonet PhotographyMamiya RZ67 105 mm 6 7 60 mm Bayonet PhotographyMamiya RB67 112 mm 6 7 60 mm Bayonet PhotographyMamiya ZE 45 5 mm 35 mm Bayonet PhotographyMamiya Sekor E 43 5 mm 35 mm 49 mm Bayonet PhotographyPentax 645 70 87 mm 6 4 5 61 2 mm Bayonet PhotographyPentax 6x7 84 95 mm 6 7 72 mm Bayonet PhotographyPentacon Six 74 1 mm 6 6 60 mm Breech lock PhotographyFujifilm G 26 7 mm 43 8x32 9 mm 65 mm 7 Bayonet Photography Digital Fujifilm GFX seriesRolleiflex SL66 102 8 mm 6 6 Bayonet PhotographyRolleiflex SL35 44 46 mm 35 mm 46 mm Bayonet PhotographyRMS thread society thread 150 180 mm 0 8 Whitworth 36 tpi Screw Microscope older microscopesLeicaNikon Biological Unknown M25 0 75 mm Screw MicroscopeBD Mount Unknown M26 0 7 mm Screw Microscope MitutoyoOlympus BDNikon BDZeiss Unknown M27 0 75 mm Screw MicroscopeTFL 8 17 526 mm 28 mm M35 0 75 mm Screw Machine VisionTFL II 9 17 526 mm 35 mm M48 0 75 mm Screw Machine VisionFor small camera modules used in e g CCTV systems and machine vision a range of metric thread mounts exists The smallest ones can be found also in e g cellphones and endoscopes The most common by far is the M12x0 5 followed by M8x0 5 and M10x0 5 10 M4 2x0 2 1 7 sensors M4 6x0 25 1 5 2 4mm 3 8mm sensors industrial endoscopes M5x0 35 1 6 1 5 sensors M5 5x0 35 1 7 1 5 8 1 5 1 4 sensors M6x0 35 1 4 5 2mm 4 85mm sensors M6 4x0 25 1 3 sensors M7x0 35 1 8 1 7 1 6 1 5 1 4 1 3 6 1 3 2 1 2 7 4 85mm sensors M8x0 35 1 4 1 3 sensors M8x0 5 1 5 1 4 1 3 sensors sometimes occurs in diode laser modules M9x0 5 1 2 7 1 3 1 3 2 sensors also commonly encountered in diode laser modules M10x0 5 1 4 1 3 sensors M12x0 5 the S mount listed in the table M22x0 5 1 1 2 sensors Focusing lens mount EditThe axial adjustment range for focusing Ultra wide angle lenses and some Wide angle lenses in large format cameras is usually very small So some manufacturers e g Linhof offered special focusing lens mounts so called wide angle focusing accessories for their cameras With such a device the lens could be focused precisely without moving the entire front standard Secondary lens mount Edit A teleconverter attached between a camera and its objective Secondary lens refers to a multi element lens mounted either in front of a camera s primary lens or in between the camera body and the primary lens D SLR camera amp interchangeable lens manufacturers offer lens accessories like extension tubes and secondary lenses like teleconverters which mount in between the camera body and the primary lens both using and providing a primary lens mount Various lensmakers also offer optical accessories that mount in front of the lens these may include wide angle telephoto fisheye and close up or macro adapters Canon PowerShot A and Canon PowerShot G cameras have a built in or non interchangeable primary zoom lens and Canon has conversion tube accessories available for some Canon PowerShot camera models which provide either a 52mm or 58mm accessory filter screw thread Canon s close up wide WC DC and tele conversion TC DC lenses have 2 3 and 4 element lenses respectively so they are multi element lenses and not diopter filters Lens mount adapters Edit This lens adapter is a passive adapter designed for mounting a Nikon F mount lens to a Micro Four Thirds camera Main article Lens adapter Lens mount adapters are designed to attach a lens to a camera body with non matching mounts Generally a lens can be easily adapted to a camera body with a smaller flange focal distance by simply adding space between the camera and the lens When attempting to adapt a lens to a camera body with a larger flange focal distance the adapter must include a secondary lens in order to compensate This has the side effect of decreasing the amount of light that reaches the sensor as well as adding a crop factor to the lens Without the secondary lens these adapters will function as an extension tube and will not be able to focus to infinity 11 See also EditISO metric screw thread Lens boardNotes Edit A The authoritative normative source for 4 3 standards information is Four Thirds Org and not 3rd party reviews 4 3 s published facts Size of the 4 3 type Sensor The standard diagonal length of the sensor is 21 63 millimetres 0 852 in It is half that of 35 mm film format 36 millimetres 1 4 in x 24 millimetres 0 94 in 43 27 millimetres 1 704 in The image circle of the interchangeable lens is specified based on this diagonal length The focal length is about a half that of a 135 film camera lens assuming the same angle of view 12 The foundation for the high picture quality of the Four Thirds system is the lens mount which is about twice the diameter of the image circle 13 Differences between Four Thirds System mount and Micro Four Thirds System mount Mount diameter reduction As a result of research aimed at facilitating the design of compact lightweight lenses while maintaining the current strength the outer diameter of the lens mount has been reduced by approx 6 millimetres 0 24 in the Micro Four Thirds System specifies the optimum flange back length required to reduce camera size and thickness assuming the omission of the mirror box The flange back length has been reduced to about 1 2 that of the Four Thirds System 14 So 21 63mm 2 43 26 millimetres 1 703 in or 44mm 43 26mm 6mm 37 26 millimetres 1 467 in or 38mm 21 63 m m 2 17 3 m m 2 12 98 m m 2 displaystyle mathrm 21 63 mm 2 17 3 mm 2 12 98 mm 2 See Pythagorean theorem 5 2 4 2 3 2 displaystyle 5 2 4 2 3 2 NOTE Some published reviews of 4 3 instead cite the female outside diameter of the lens or mount as 50mm and micro 4 3 as 44mm 15 and not the appropriate major diameter D 44mm which is the camera body s female mount inside diameter and the lens s male mount outside diameter micro 4 3 38mm References Edit Camera Story 1987 1991 EOS Canon Archived from the original on 2008 07 24 Retrieved 2008 07 22 Debut of Nikon F Nikon Archived from the original on 2020 08 12 Retrieved 2020 10 26 Hornberg Alexander 2007 02 27 Handbook of Machine Vision John Wiley amp Sons ISBN 9783527610143 The M42 Praktica mount is sometimes referred to as a P thread See e g Questar Corporation Photographic Camera Adapters P Thread Retrieved 2017 03 01 Mamiya 6 www kenrockwell com Camera Mounts Sorted by Register www graphics cornell edu Retrieved 2018 08 23 FUJIFILM GFX 50S Features Fujifilm Retrieved 2018 05 23 Lens Mounts Edmund Optics Lens Mounts Edmund Optics cctvopticallens m12 and cs mount lens provider www cctvopticallens com Retrieved 3 April 2018 Lens mount compatibility chart Retrieved 2016 11 29 About Four Thirds Standard Whitepaper Summary of Standard Four Thirds System Archived from the original on 2009 03 07 Retrieved 2008 08 11 About Four Thirds Standard Benefits of Four Thirds Four Thirds System Retrieved 2008 08 11 Micro Four Thirds Standard Whitepaper Summary of Standard Four Thirds System Retrieved 2008 08 11 Olympus and Panasonic announce Micro Four Thirds Digital Photography Review Sources Edit Markerink Willem Jan Camera mounts amp registers Archived from the original on 2007 11 24 Retrieved 2007 09 20 External links EditSLR Mount Identification Guide List of Camera Mount Type and Register for Mechanical amp Optical Instruments https web archive org web 20081221083400 http medfmt 8k com Camera mounts amp registers from Robert Monahan Medium Format Photography Megasite http www markerink org WJM HTML mounts htm Camera mounts amp registers from Willem Jan Markerink Camera Mounts Sorted by Register Alphabetical List of Camera Mounts Nikon Lens Nomenclature a study in frustration Adaptall 2 com DPReview Hands on preview of Fujifilm X Pro1 DPreview Hands on preview of Canon EOS M Standard GOST 10332 72 in Russian M42 1 45 5 M39 1 28 8 Standard GOST 10332 63 in Russian M39 1 45 2 aka Z39 M39 1 28 8 bayonet C cameras Zenit 5 Zenit 6 Zenit 7 bayonet Zenit 7 in Russian Retrieved from https en wikipedia org w index php title Lens mount amp oldid 1146150558, wikipedia, wiki, book, books, library,
