Pentax K mount 3190011 224549766 2008-07-09T10:44:47Z 202.14.152.15 Addition of a Ricoh camera model that uses K-mount [[Image:Pentax K1000 lens off.jpg|thumb|right|[[Pentax K1000]] without lens, showing the original K mount]] The '''Pentax K mount''', sometimes referred to as the "PK mount", is a [[lens mount]] standard for mounting interchangeable [[photographic lens]]es to [[135 film|35&nbsp;mm]] [[single-lens reflex]] (SLR) [[camera]]s. It was created by [[Pentax]] in [[1975]],<ref>{{cite web | url = http://www.bdimitrov.de/kmp/ | title = Bojidar Dimitrov's Pentax K-Mount Page | accessdate=2007-09-30 }}</ref> and has been used by all 35&nbsp;mm and digital Pentax SLRs since. A number of other manufacturers have also produced many K-mount lenses and K-mount cameras. == Mounts == The Pentax K mount has undergone a number of evolutions over the years as new functionality has been added. In general, the term K mount may refer to the original K mount, or to all its variations. === K mount === The original K mount is a simple bayonet connection with three tabs. It was introduced with the K series of cameras. The lens is locked into the camera with an approx. 70° clockwise turn (when looking at the front of the camera). The only linkage with the camera is mechanical and involves the [[aperture]]. A slot between two of the bayonet tabs on the lens allows the ''stop-down coupler'' from the camera to sense the aperture setting on the lens and adjust the light meter display accordingly. Opposite this is the [[Diaphragm (optics)|diaphragm]] release from the lens which extends into the camera body and holds open the spring loaded diaphragm of the lens. When setting up a shot this keeps the diaphragm fully open. When the shutter is released, so is this lever. It allows the diaphragm to close to the desired setting while the film is being exposed, and opens it again after the shutter closes. Both of these linkages are of course arranged so that they are aligned and spring-loaded by the act of inserting the lens and turning it until it locks. Bodies equipped with the original K mount include the K series, the M series except the ME F, and the [[Pentax LX|LX]]. Lenses that support it include those labelled 'SMC Pentax' and 'SMC Pentax-M'. These K mount bodies cannot use lenses that lack an aperture ring, such as FAJ, DA or D-FA. K-mount lenses can be used on all Pentax bodies, but can only be used in stopped down mode with "crippled" K<sub>AF</sub> mount bodies (see below). === K<sub>F</sub> mount === The K<sub>F</sub> mount was Pentax's first attempt at an [[autofocus]] system. This autofocus system used sensors in the camera body and a motor in the lens. The two were connected via five new electrical contacts on the bayonet mount itself. One permitted the lens to turn on the camera's metering and focus sensors, two focused the lens (towards and away from infinity) and two appear to have been unused and may have been reserved for future functionality. The K<sub>F</sub> mount was largely a failure. Only one camera and one lens ever used this mount, the [[Pentax ME F]] and [[SMC Pentax-AF 35-70/2.8]]. The lens was somewhat large and cumbersome[http://www.bdimitrov.de/kmp/bodies/photos/ME_F_AF35-70f2.8.jpg] since it had to enclose both the focusing motor (with gears) and batteries to power it. K<sub>F</sub> and the ME-F are similar in many ways to the system used by [[Canon (company)|Canon]] in the ill fated [[Canon T80]], introduced several years later. The ME F can use all Pentax K-mount lenses except for FAJ lenses, which lack an aperture ring. The 35-70&nbsp;mm lens can be used on all other Pentax K-mount bodies in manual focus mode, but it must be used stopped down on "crippled" K<sub>AF</sub> bodies. === K<sub>A</sub> mount === The K<sub>A</sub> mount is derived from the original K mount. It allows the lens' [[aperture]] to be set by the body, and thus permits [[shutter priority]] and program [[Exposure (photography)|auto exposure]] modes. It was introduced in 1983, and is supported by A-series and P-series bodies; Pentax lenses that support it are marked 'SMC Pentax-A'. It is completely backward-compatible with the original K mount. The aperture on the lens is set from the body by the same stop-down lever found on the original K mount, but on K<sub>A</sub> lenses this lever is proportional to the area of the aperture opening, rather than the diameter as on previous lenses. This allows the body to easily set a specific aperture, since the relationship to [[F stop]]s is linear. The lenses add an 'A' setting on the aperture dial, which gives the body control of the aperture. Other, numeric settings are used for manual aperture modes—[[aperture priority]] and full manual mode. Six electrical contacts are added to the bayonet ring. One is slightly recessed and allows the lens to indicate whether the aperture ring is set at 'A' or not. If it is, a pin on the lens extends slightly and makes contact, while if the lens is at any other setting the pin is retracted and does not make contact. The other five contacts are used to encode the lens' aperture range. Each contact on the lens is either conducting or non-conducting, providing a binary 1 or 0, respectively. Two contacts encode the lens' minimum aperture—{{f/|16}}, {{f/|22}}, {{f/|32}} or {{f/|45}}; although no Pentax K-mount lens has ever had an {{f/|16}} minimum aperture, OEM lenses often have. The other three contacts encode the lens' maximum aperture; their meaning is dependent on the minimum aperture indicated by the lens. === K<sub>AF</sub> mount === The K<sub>AF</sub> mount was Pentax's second and much improved attempt at adding auto-focus to lenses. It adds a small drive shaft to the K<sub>A</sub> mount, allowing the body to adjust the focus of the lens. This makes the lenses less bulky than the earlier K<sub>F</sub> mount, which had both a motor and batteries inside the lens. It also adds a seventh electrical contact, this one carrying digital information from the lens to the camera. It carries the following information: focal length, distance to the subject, exact absolute f-stop value, and lens size. This information is used to make better exposure decisions, along with the multi-segmented metering that was introduced in cameras using the K<sub>AF</sub> mount. === K<sub>AF2</sub> mount === [[Image:K-mount-late-(Pentax-MZ3).jpg|thumb|right|Pentax MZ-3 showing the K<sub>AF2</sub> mount, with electrical contacts and autofocus transmission coupling]] The K<sub>AF2</sub> mount is the same as the K<sub>AF</sub> mount except that it adds two extra contacts to the inside of the mounting ring for power zooming, and transmits [[optical transfer function|modulation transfer function]] (MTF) data through the digital seventh contact. On the K10D digital SLR model (and later models like [[K100D Super]], [[Pentax_K20D|K20D]] and [[Pentax_K200D|K200D]]) the two power contacts can also power [[Ultrasonic motor|Supersonic Drive Motor]] lenses. === K<sub>A2</sub> mount === The K<sub>A2</sub> is identical to K<sub>AF</sub>, but lacks the autofocus drive shaft. Another way of looking at it is that it adds the seventh contact for digital information to the K<sub>A</sub> mount. === "Crippled" K<sub>AF</sub> mount === The "crippled" K<sub>AF</sub> mount is used on the MZ-30/ZX-30, MZ-50/ZX-50, MZ-60/ZX-60, the *ist series and the K100D/K110D. The only difference between the regular K<sub>AF</sub> mount and the crippled version is the removal of the mechanical stop-down coupler/indicator. The result is that most of these bodies can only correctly use lenses which have an "A" setting on the aperture ring or "crippled" K<sub>AF</sub> lenses. With a K/M (also known as "pre-A") lens, the body cannot tell what aperture the lens is set to with the "crippled" mount. The *ist series and K series digital cameras have a work-around which allows K/M lenses to be used in full manual exposure mode by simply pressing the AE-Lock button to stop down the lens and take a meter reading. The onbody flash only fires at full power, making it difficult with pre-A lenses (a Flash [[Guide Number]] calculation is required). This lens mount includes DA and FA-J series lenses. === "Crippled" K<sub>AF2</sub> mount === [[Image:Pentax K10D front.jpg|thumb|right|[[Pentax K10D]] "Crippled" K<sub>AF2</sub> mount]] The "crippled" K<sub>AF2</sub> mount is found on Pentax DSLRs released beginning with the [[Pentax K10D|K10D]]. It supports the extra features of the K<sub>AF2</sub> mount including the two power contacts for the lens. Power zoom is supported (not full support and only in K10D), as well as lenses with focus motors. Such lenses support [[Ultrasonic motor|Supersonic Drive Motor]] (SDM), allowing for quieter autofocus. Like the "crippled" K<sub>AF</sub> mount, it does not have a mechanical stop-down coupler/indicator and thus can only use stop-down metering on pre-A lenses. === R-K mount === The R-K mount is a variation on the original K mount by Ricoh. It supports Ricoh's own implementation of shutter priority and auto exposure modes, similar to the K<sub>A</sub> mount but much simpler. The only addition to the original K mount is a small pin at the bottom which tells the body when the aperture ring has been set to the "P" setting (similar to the "A" setting on Pentax K<sub>A</sub> lenses). '''Warning: This pin will catch on the drive-shaft hole in K<sub>AF</sub> and K<sub>AF2</sub> cameras when turning the lens to lock it in place. It will jam part way and depending on the characteristics of this pin, it may be quite difficult to remove the lens from the camera.'''<ref>{{cite web | url=http://forums.dpreview.com/forums/read.asp?forum=1036&message=11474423 | title=Caution regarding Ricoh lenses on Pentax bodies | date=[[December 17]] [[2004]] | accessdate=2007-07-24 | publisher=[[DPreview]]}}</ref><ref>{{cite web | url=http://forums.dpreview.com/forums/read.asp?forum=1036&message=19214685 | title=Sears 60-300 (auto aperture, push pull zoom) | date=[[July 15]] [[2006]] | accessdate=2007-07-24 | publisher=[[DPreview]]}}</ref> The R-K mount is used on Rikenon P lenses, Ricoh bodies that include the letter 'P' in their model number, and some non-Ricoh lenses. It is compatible with all other K-mount cameras and lenses when in manual or aperture-priority exposure modes, however the extra pin needs to be removed for safe use on autofocus Pentax cameras. <!-- Is the "P" aperture setting compatible with Pentax's "A" setting? i.e does the stop-down lever operate the same? --> ==Adaptors== Pentax supplies adaptors to fit [[M42 lens mount|M42]] screw-mount lenses and for lenses for its medium-format cameras, both the 645 and 6x7. Also Promaster also makes a M42 to K Mount Adapter. And [[Hartblei]] and [[Arsat]] do the same so their [[M42]] and [[Pentacon]] mount lenses can be mounted on K mount cameras. There is also some [[Petri|Petri(camera)]] adpater to k mount but those do not allow to focus toinfinity due to the different [[focal lenght]]. == Cameras == {{Col-begin}} {{Col-2}} === Pentax === '''Manual focus''' * ''K'' - K2, KX, KM, [[Pentax K1000|K1000]] * ''K'' - ME, ME Super, MG, MV, MV1, [[Pentax MX|MX]] * ''K'' - [[Pentax LX|LX]] * ''K<sub>A</sub>'' - SuperA, ProgramA, A3 * ''K<sub>A</sub>'' - P3, P5, P30, P30n, P30t * ''K<sub>A2</sub>'' - MZ-M '''Auto focus''' * ''K<sub>F</sub>'' - ME F * ''K<sub>AF</sub>'' - SFX, SFXn, SF7, MZ-6, MZ-7 * ''K<sub>AF2</sub>'' - Z-1, Z-5, Z-10, Z-20, Z-50, Z-70 * ''K<sub>AF2</sub>'' - [[Pentax MZ-S|MZ-S]], MZ-3, MZ-5, MZ-5n, MZ-6, MZ-10 * ''"crippled" K<sub>AF</sub>'' - MZ-30, MZ-50, MZ-60, *istD, *istDS(2), *istDL(2), [[K100D]], K110D * ''"crippled" K<sub>AF2</sub>'' - [[Pentax K10D|K10D]], K100D Super, [[Pentax K20D|K20D]], [[Pentax K200D|K200D]] === [[Almaz]] === * 103 === [[Chinon]] === * CE-4, CE-4s, CA-4, CM-4 * CE-5, CG-5, CM-5, CP-5 * CP-6, CP-X * CP-7, CM-7 * CP-9 === [[Cosina]] === * CS-2, CS-3 * CT-10, CT-1A, CT-20, CT-7, CT-1G, CT-9 * CE-4, CE-4s, CE-5 {{Col-2}} === [[Miranda Camera Company|Miranda]] === * MS-2 Super * MS-3 === [[Ricoh]] === * KR-5 series, KR-10, KR-10 Super, KR-30 * XR-1, XR-2, XR-500, XR-6, XR-7, XR-10, XR-20, XR-Solar, XR-M, XR-F, XR-P, XR-S, XR-X, XR-X 3PF === [[Samsung]]<ref>{{cite web | url=http://www.samsungcamera.com | title=Samsung Digital Camera | date=[[April 4]] [[2008]] | accessdate=2008-04-05 | publisher=[[Samsung Techwin]] (subsidiary of [[Samsung Group]])}}</ref> === *''"crippled" K<sub>AF</sub>'' - GX-1S, GX-1L *''"crippled" K<sub>AF2</sub>'' - [[Samsung GX-10|GX-10]], [[Samsung GX-20|GX-20]] === [[Sears, Roebuck and Company|Sears]] === A lot of Sears cameras were made by Ricoh and use the Pentax K mount. Some are simply rebadged Ricoh models, while others are quite different. * KS-1000 (Ricoh XR-1) * KS-500 (Ricoh XR-500) * KS Auto (Ricoh XR-2S) * KS-1 * KS-2 (Based on Ricoh XR-10, but with aperture priority exposure) * KSX (Ricoh KR-10) * KS Super * KS Super II - fully automatic using a K<sub>A</sub> mount === [[Vivitar]] === * V4000 * V3800N * V3000s * V2000 === [[Voigtlander]] === * VSLR 43 (2004) === [[Zenit (camera)|Zenit]] === * Automat, 20, 21, 22, 14, photosniper FS-5 * AM, AM2, AP, 2000, APK, KM, 122K, 212K {{Col-end}} == List of Lenses with any K-Mount Variant== ===Primes=== ====[[Wide Angle]] ==== *Pentax DA 14mm f2.8 SMC ED IF (2007) *Tokina 17mm f3.5 *Sigma 20mm f1.8 EX DG ASP *Carl Zeiss Jena II 24mm f2.8 *Sigma 24mm f1.8 EX DG *Access 28mm f2.8 *Tokina 28mm f2.8 *Sigma 28 f1.8 EX DG *Access 28mm f2.8 *Tokina 28mm f2.8 *Sigma 28mm f1.8 EX DG *Revue 35mm f2.8 ====[[Normal]] ==== *Cosina 40mm f2.5 *Voigtlander 40mm f2 SL I Ultron Aspherical (2007,limited) *Voigtlander 40mm f2 SL II Ultron Aspherical (2008,limited) *Pentax SMC-M 40mm f2.8 *Luxon 50mm f2.0 MC (China) *Pentax 50mm f1.2 *Carl Zeiss Planar T* 50mm f1.4 ZK (2008) *Pentax 50mm f1.4 *Pentax FA 50mm f1.4 *[[Chinon Industries|Chinon]] 50mm f1.4 Auto Multicoated *[[Chinon Industries|Chinon]] 50mm f1.7 Auto Multicoated *Pentax 50mm f1.7 *[[Chinon Industries|Chinon]] 50mm f1.9 Auto *Pentax A 50mm f2 SMC *Revu 50mm f1.2 (1975) *Cosina 50mm f1.2 *Sigma 50mm f2.8 EX Macro *Revuenon 55mm f1.2 *Porst 55mm f1.2 MC Auto *Voigtlander 58mm f1.4 SL II Topcor (2008, SL I never available for K Mount) *Voigtlander Nokton 58mm f1.4 (2008) *Pentax DA 70mm f1.4 Limited (2007) *Voigtlander 75mm f2.5 Color-Heliar (2002-200?) ====Long==== *Pentax SMC FA* 85mm f1.4 *Carl Zeiss ZK Planar T* 85mm F1.4 (2008) *Pentax-A* SMC 85 f1.4 (1984) *Pentax-K SMC 85 f1.8 Super-Takumar *Pentax-M SMC 85 f2 Super-Takumar *Pentax SMC 85 f1.9 *Pentax 85 f1.9 Super-Takumar *Pentax SMC-M 85 f2 *Tamron 90mm f2.5 Macro (No Adaptall version) *Tamron 90mm f2.8 SP Macro (No Adaptall version) *Vivitar 90mm f2.5 SL I Macro (2002-?) *Voigtlander 90mm f3.5 APO-Lanthar *Cosina 100mm f/3.5 AF macro *Sigma 105mm f2.8 EX Macro *Voigtlander SL 125mm f2.5 APO-Lanthar (2002-2006) *Voigtlander SL II 125mm f2.5 APO-Lanthar (2007) *Revuenon 135 f2.8 *Vivitar 135 f2.8 ====[[Tele]] ==== *Sigma 180mm f3.5 EX Macro *Voigtlander SL 180mm APO-Lanthar f4 (2002-2006) *Voigtlander SL II 180mm APO-Lanthar f4 (2007) *Pentax DA* 200mm f2.8 SMC ED IF (2007) *Oberon-11K 200mm f2.8 *Porst 200mm f3.5 ===Zoom=== ====[[Wide Angle]]==== *Pentax DA 12-24 f4 SMC AL ED IF (2007) *Sigma 15-30MM f3.5-5.6 AF EX DG *Pentax DA 16-50 f2.8 AL ED IF *Sigma 17-35mm f2.8-4 EX ASP *Cosina 19-35mm f3.5-4.5 AF ====[[Wide Normal]] ==== *Sigma 17-70mm f2.8-4.5 DC Macro (2007) *Sigma 18-50mm f2.8 EX DC *Sigma 20-40mm f2.8 EX DG ASP *Sigma 24-70mm f2.8 EX ASP *Sigma 24-70mm f3.5-5.6 *Sigma 28-70mm f2.8 EX DF ASP *Revue 28-50mm f3.5-4.5 *Revue 28-70mm f3.5-4.5 *Voigtlander 35-70mm f3.5-4.8 (2004) ====[[Wide Long]] ==== *Sigma 18-200mm f3.5-5.6 DC *Sigma 28-80mm f2.8 EX DF ASP Macro *Sigma 28-80mm f2.8 EX DF ASP Macro II *Sigma 28-105mm f2.8-4 ASP ====[[Wide Tele]] ==== *Sigma 28-200mm f3.5-5.6 *Sigma 28-200mm f3.5-5.6 DL Macro *Cosina 28-210mm f3.5 Aspherical AF *Cosina 28-210mm f4.2-6.5 Aspherical AF *Sigma 28-300mm f3.5-6.3 DL ASP IF *Sigma 28-300mm f3.5-6.3 CHZ ASP *Pentax DA* 50-135 f2.8 SMC ED IF SDM (2007) ====[[Normal Tele]] ==== *Sigma 50-500mm f4-6.3 EX APO HSM *Sigma 70-200mm f2.8 EX APO *Sigma 70-200mm f2.8 EX DG Macro *[[Miranda Camera Company|Miranda]] 70-210mm f4.5 Macro *Sigma 70-300mm f4-5.6 EX APO Macro *Sigma 70-300mm f4-5.6 DG Macro *Sigma 70-300mm f4-5.6 DL Macro *Sigma 70-300mm f4-5.6 DI LD Macro (2008) *Carl Zeiss Jena 70-210mm f4.5-5.6 Macro *Promaster Spectrum 7 AF EDO 70-300mm f4-5.6 LD Macro (2007) *Sigma 70-300mm f4-5.6 DG Macro *Sigma 70-300mm f4-5.6 DG APO Macro *Porst 75-260mm f4.5 *Pentax FA J 75-300mm f4.5-5.6 ED IF *Carl Zeiss Jena 75-300mm f4.5-5.6 ED IF MC Macro Jenazoom *Revue 80-200mm f4.5 *Pentax SMC 85-210mm f4.5 *Beroflex 85-210mm f3.8 *Vivitar 85-205mm f3.8 *Sigma 100-300mm f4 EX APO IF *Sigma 100-300mm f4.5-6.7 DL *Sigma 100-300mm f4.5-6.7 DL *Sigma 135-400mm f4.5-5.6 APO ASP *Sigma 170-500mm f5-6.3 APO ASP ===Reflex=== ====Reflex Primes ==== *Tamron 300mm f2.8 DL (Adaptall) Reflex([[Catadioptric]]) *Tamron 500mm f8 SP (Adaptall 2) Reflex([[Catadioptric]]) *Tokina 500mm f8 RMC Reflex([[Catadioptric]]) *Phoenix 500mm f8 Reflex([[Catadioptric]]) (2006) *Polar 800mm f8 Reflex([[Catadioptric]]) (2008) *Phoenix 800mm f8 Reflex([[Catadioptric]]) (2008) *Pentax 1000mm f11 SMC Reflex ([[Catadioptric]]) ====Zoom Reflex ==== *Pentax SMC 400-600mm f8-12 Reflex([[Catadioptric]]) {{incomplete list}} == References == {{reflist}} == More information == * [http://www.pentaximaging.com/products/cameras/lenses/compatability_chart.jsp Pentax Imaging: Lens compatibility chart] * [http://www.bdimitrov.de/kmp/ Bojidar Dimitrov's Pentax K-Mount Page] * [http://www.butkus.org/chinon/ultimate_k-mount.htm List of cameras with a Pentax K mount] * [http://www.aohc.it/slre.htm AOHC: Asahi & Pentax SLR names and dates] [[Category:Photographic lenses]] [[Category:Lens mounts]] [[Category:Pentax|K mount]] [[de:Pentax-K-Bajonett]] [[ko:펜탁스 K 마운트]] [[pl:Bagnet K]] [[ru:Байонет K]]