{{Short description|Property of a lens mount system}} {{distinguish|front focal distance}} {{more footnotes needed|date=March 2013}} [[File:Flange Focal Length (2 types camera).PNG|thumb|upright|alt=Image of Flange focal Length (2 types camera)|Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera]]
For an interchangeable lens camera, the '''flange focal distance''' ('''FFD''') (also known as the '''flange-to-film distance''', '''flange focal depth''', '''flange back distance''' ('''FBD'''), '''flange focal length''' ('''FFL'''), '''back focus'''<ref>{{Cite web|url=https://thecinelens.com/2009/05/30/focus-on-back-focus/|title = FOCUS BACK ON BACK FOCUS| date=30 May 2009 }}</ref> or '''register''', depending on the usage and source) of a lens mount system is the distance from the mounting flange (the interlocking metal rings on the camera and the rear of the lens) to the film or image sensor plane.
The flange focal distance is a fixed mechanical specification of a given camera system, and it must be manufactured to a precision of hundredths of a millimetre—even small deviations can prevent lenses from achieving accurate focus across all focal lengths. This value should not be confused with depth of field, which refers to the range of distances in front of the camera that appear acceptably sharp during image capture.
Lenses can be adapted from one mount (and respective FFD) to another using a lens adapter. FFD determines whether infinity focus can be accomplished with a simple non-optical adapter. Optics to correct for distance introduce more cost and can lower image quality, so non-optical lens adapters are preferred. A simple non-optical adapter holds the longer FFD lens the appropriate additional distance away from the sensor or film on the shorter FFD camera. A ''camera body'' with a ''shorter'' FFD can accept a larger number of lenses (those with a longer FFD) by using a simple adapter. A ''lens'' with a ''longer'' FFD can be more readily adapted to a larger number of camera bodies (those with a shorter FFD). If the difference is small, other factors such as the sizes and positions of the mounting flanges will influence whether a lens can be adapted without optics.
==Standard mounts==
Typically, camera bodies with shorter flange focal distance can be adapted more readily to lenses with longer flange focal distance.
{{sticky header}} {| class="wikitable sticky-header sortable" |- !width=250|Mount !width=100 data-sort-type="number" |Flange<br />focal distance !Type !Format !Production !Prime lenses<!-- any format (but can be listed separately e.g. 23+12), no third-party lenses --> !Zoom lenses<!-- any format (but can be listed separately e.g. 23+12), no third-party lenses --> !Wide/tele converters<!-- includes both rear and front converters (but can be listed separately e.g. 4+1), no third-party parts --> !Mount converters<!-- no third-party parts --> !Comments |- |Samsung NX mini || 6.95 mm || Mirrorless || 1" (8.80x13.20mm)|| 2014–2015 || 2 || 1 || || 1 | |- | Pentax Q-mount || 9.2 mm<ref>[http://www.pentax.jp/english/news/2011/201109.html] {{Webarchive|url=https://web.archive.org/web/20120319184846/http://www.pentax.jp/english/news/2011/201109.html|date=2012-03-19}} pentax.jp</ref>|| Mirrorless || 1/2.3" (6.17×4.55 mm) / 1/1.7" || 2011–2019 || data-sort-value="5"|5 || data-sort-value="3"|3 || data-sort-value="0"|0 || data-sort-value="1"|1 || |- |M58×0.75 mm mount || 12 mm || Industrial || 24×36 mm || || || || || || Industrial area and line scan cameras |- | D-mount || 12.29 mm || cine || 8 mm || || || || || || (8 mm movie cameras) |- | CS-mount || 12.526 mm<ref>{{Cite book|url=https://books.google.com/books?id=HEy4UBoGF2UC&q=cs-mount+%2212.526%22&pg=PA49|title=Handbook of Machine Vision|last=Hornberg|first=Alexander|date=2007-02-27|publisher=John Wiley & Sons|isbn=9783527610143|language=en}}</ref><ref>{{Cite web|url=https://www.edmundoptics.com/resources/glossary/c/cs-mount/|title=CS-Mount {{!}} Edmund Optics|website=www.edmundoptics.com|language=en|access-date=2018-07-28|archive-date=2018-07-28|archive-url=https://web.archive.org/web/20180728191314/https://www.edmundoptics.com/resources/glossary/c/cs-mount/|url-status=dead}}</ref><ref>{{Cite news|url=http://www.universeoptics.com/optical-lens-design/flangeback-distances/|title=Flangeback Distances {{!}} Universe Optics|work=Universe Optics|access-date=2018-07-28|language=en-US}}</ref>|| TV || 1/4", 1/3", 1/2" || || || || || || (surveillance cameras) |- | rowspan="2"|Nikon Z-mount || rowspan="2"|16 mm || rowspan="2"|Mirrorless || 24×36 mm (FX) || 2018– || 25 || 17 || 2 || rowspan="2" | 1 || Lens count doesn't include 3rd party products and optically identical "SE" versions. |- | APS-C (DX) || 2018– || 2 || 6 || || Lens count doesn't include 3rd party products and optically identical "SL" versions. Can use any of the 24x36 mm (FX) lenses and the FTZ/FTZ II mount adaptor. |- | DJI DL-mount || 16.84 mm<ref>{{Cite web|url=https://www.dpreview.com/news/2095513456/dji-launches-zenmuse-x7-super-35mm-camera-module-with-raw-video-capture|title = DJI launches Zenmuse X7 Super 35mm camera module with Raw video capture|website=dpreview.com}}</ref> || Mirrorless || Super 35 || 2017– || 6 || 1 || || || For use on aerial drone and gimbal cameras. |- | Nikon 1-mount ||17.00 mm<ref>{{Cite web|url=https://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html|title = Camera Mounts Sorted by Register}}</ref> || Mirrorless || CX || 2011–2018 || 3 || 8 || || 1 || |- | C-mount || 17.526 mm<ref name="ikegami.com">{{cite web|url=https://www.ikegami.com/cb/products/pdf/tech/lensmount.pdf|title=C-Mount vs. CS-Mount|website=ikegami.com|archive-date=2003-03-24|archive-url=https://web.archive.org/web/20030324075611/http://www.ikegami.com/cb/products/pdf/tech/lensmount.pdf|access-date=23 January 2026|url-status=dead}}</ref><!-- 0.6900in --> || cine / TV || 8 mm, 16 mm, 1/3", 1/2", 2/3", 1", 4/3" || ~1926– || || || || || (Bolex, Eclair and Bell & Howell) |- | Fujifilm X-mount || 17.7 mm || Mirrorless || APS-C || 2012– || 23<!-- as of 2023-12 --> || 14<!-- as of 2023-12 --> || 2<!-- as of 2016-12 --> || 1<!-- as of 2015-05 --><ref name="Fuji_M-Adapter">{{Cite web|url=https://fujifilm-x.com/global/products/accessories/lens-accessories/|title=Lens accessories | Accessories|website=FUJIFILM X Series & GFX – Global|date=11 January 2024 }}</ref> || |- | Canon EF-M-mount || 18.00 mm || Mirrorless || APS-C || 2012– || 3 || 5 || 0 || 1 || |- | rowspan="2"|Sony E-mount || rowspan="2"|18.00 mm || rowspan="2"|Mirrorless || APS-C || 2010– || data-sort-value="17"|6<!-- E primes up to 2020-01-05 --> || data-sort-value="24"|14<!-- E zooms up to 2020-01-05 --> || data-sort-value="8"|4<!-- E tele converters up to 2015-03-04 --> || data-sort-value="4"|2<!-- E mount converters up to 2015-03-04 --> || Lens count doesn't include 3rd party products. All FE lenses (see below) can also be used on APS-C E-mount cameras. |- | 24×36 mm (FE) || 2013– || data-sort-value="17"|22<!-- FE primes up to 2021-04-12 --> || data-sort-value="24"|17<!-- FE zooms up to 2021-04-12 --> || data-sort-value="8"|4<!-- FE tele converters up to 2016-07-16 --> || data-sort-value="4"|3<!-- FE mount converters up to 2020-01-05 --> || Lens count doesn't include 3rd party products. |- | rowspan="2"|Sony FZ-mount || rowspan="2"|19.00 mm || rowspan="2"|cine || Super 35<!-- possibly larger --> || 2011– || 0 || 2 || 0 || 3<!-- PL, 2xB4 --> || |- | 24×36 mm || 2015– || 1 || 2 || | || || |- | Micro Four Thirds System || 19.25 mm || Mirrorless || 4/3" || 2008– || 37 || 28 || 1 || 1 || |- | Hasselblad XCD mount || 18.14 mm (+0.05/-0.00) || Mirrorless || Medium Format (127) 43.8×32.9 mm || 2017– || 13 || 1 || || 3 || for Hasselblad X System |- | rowspan=2 | Canon RF mount || rowspan=2 | 20.00 mm || rowspan=2 | Mirrorless || 24×36 mm || 2018– || 25 || 22 || rowspan=2 | 2 || rowspan=2 | 3 || Lens count does not include third-party lenses. All RF lenses can be used on Canon RF-S (APS-C) systems. |- | APS-C (RF-S) || 2022– || 2 || 5 || Lens count does not include third-party lenses. RF-S lenses can be used on Canon full-frame RF systems, with the camera automatically cropping the image to APS-C size. The two RF-S dual fisheye prime lenses will mount on all RF-mount cameras, but most do not have the pixel density needed to produce the desired picture. |- | L-Mount<ref>{{Cite web|url=https://l-mount.com/en/overview-213|title=L-mount Alliance Overview }}</ref> (Leica, Panasonic Lumix, Sigma, DJI, et al.) || 20.00 mm || Mirrorless || 24×36 mm, APS-C || 2014– || 19 || 12 || || || | The members of the L-Mount Alliance are Leica Camera, Sigma, Panasonic, Ernst Leitz Wetzlar GmbH, DJI, Astrodesign, SIRUI, LK Samyang, Blackmagic Design, and Viltrox. |- | LUMIX Panasonic<ref>{{Cite web|url=https://www.panasonic.com/global/consumer/lumix/s/L-Mount.html|title=LUMIX Panasonic L-mount|website=Panasonic.com }}</ref> || 20.00 mm || Mirrorless || 24×36 mm, APS-C || 2015– || 8 || 9 || || 7 || | L-mount system |- | JVC 1/3" bayonet mount || 25.00 mm || TV || 1/3" 3-CCD (5.24×2.94 mm) || || || || || || |- | Samsung NX-mount || 25.50 mm || Mirrorless || APS-C || 2010–2015 || 8 || 8 || || || |- | Fujifilm G-mount || 26.7 mm || Mirrorless || Medium Format (127) 43.8×32.9 mm || 2017– || 7 ||2 | 1|| || for Fujifilm GFX series cameras |- | Pentax Auto 110 || 27.00 mm || SLR || 13×17 mm || 1978–1985 || 5 || 1 || 0<!-- Third-party converter don't count here --> || 0 || |- | RED ONE interchangeable mount || 27.30 mm || cine || || || || || || || |- | Leica M-mount || 27.8 (inner rails) <-> 27.95 (outer rails) mm<ref name="Fuji_M-Adapter" /> || Mirrorless || 24×36 mm || 1954– || || || || || aka Voigtländer VM-mount, Epson EM-mount, Zeiss ZM-mount as well as Konica KM-mount (Hexar RF) and Minolta M-mount (CL/CLE) |- | M39×26tpi mount || 28.80 mm || Mirrorless || 24×36 mm || || || || || || Leica M39×26tpi aka LTM (Leica Thread Mount) aka L39 (not to be confused with M39×1) |- | M39×1/28.8 mount || 28.80 mm<ref>{{Cite web|url=https://www.cameramanuals.org/russian_pdf/zorki.pdf|title=The Camera ZORKI Instruction Manual?}}</ref>|| Mirrorless || 24×36 mm || 1948-1978 || || || || || Zorki M39×1/28.8 for Zorki cameras (not to be confused with M39×1 and M39x26tpi) |- | Contax G-mount || 29.00 mm || Mirrorless || 24×36 mm || 1994–2005 || 6 || 1 || 0 || 1 || |- | Olympus PEN F (film) || 28.95 mm || SLR || 18×24 mm || 1963–1972 || 16 || 2 || || || |- | Hasselblad XPan || 34.27 mm || Mirrorless || 24×36 mm & 24×65 mm || 1998–2003 || 3 || 0 || 0 || 0 || Identical to Fujifilm TX series cameras and mount |- | Contax RF-mount || 34.85 mm || Mirrorless || 24×36 mm || || || || || || |- | Nikon S-mount || 34.85 mm || Mirrorless || 24×36 mm || 1947–2005 || || || || || |- | 1/2" TV bayonet mount || 35.74 mm || TV || 1/2" 3-CCD || || || || || || JVC, Hitachi, Panasonic, others, but not Sony |- | Minolta V-mount || 36.00 mm || SLR || APS-H || 1996–1999 || 3 || 5 || 0 || 1<!-- MC-V1 --> || Vectis S-1, Vectis S-100, Dimâge RD 3000 |- | Sony 1/2" TV bayonet mount || 38.00 mm || TV || 1/2" 3-CCD || || || || || || |- | Olympus Four Thirds System || 38.67 mm || SLR || 4/3" || 2003–2017 || 12 || 30 || 2 || || |- | Nikonos || 39.00 mm<ref>{{Cite web|url=https://www.photo.net/discuss/threads/nikonos-lenses-on-nikon-dslr.456898/|title=Nikonos Lenses on Nikon dSLR?|website=Photo.net Photography Forums|date=21 January 2012 }}</ref> || underwater || 24x36 mm || 1963-2001 || 6 || 0 || 0 || 0 || this is the underwater scale focusing camera |- | Aaton mount || 40.00 mm || cine || 16 mm/S16 || || || || || || |- | Panavision SP70-mount || 38.00 mm || cine || || 2018– || || || || || 35 mm & 65 mm |- | Konica F-mount || 40.50 mm || SLR || 24×36 mm || 1960–1965 || 17<!-- http://www.buhla.de/Foto/Konica/eHexanonUebersicht.html --> || 0 || 0 || 0 || |- | Konica AR-mount || 40.50 mm || SLR || 24×36 mm || 1965–1988 || 36<!-- http://www.buhla.de/Foto/Konica/eHexanonUebersicht.html --><!-- was: 48? --> || 16 || 1 || 0<!-- was: 4? --> || |- | Canon FL-mount || 42.00 mm || SLR || 24×36 mm || 1964–1971 || || || || || |- | Canon FD-mount || 42.00 mm || SLR || 24×36 mm || 1971–1990 || 107 || 34 || || || |- | Start (Soviet SLR) || 42.00 mm || SLR || || 1958–1964 || || || || || |- | Minolta SR-mount || 43.50 mm || SLR || 24×36 mm || 1958–2001 || || || || 6<!-- E/L/M/M1/M2/P adapters -->|| |- | Fujica X-mount || 43.50 mm || SLR || 24×36 mm || 1980–1985 || || || || || |- | Pentaflex (16 mm cameras) || 44.00 mm || cine || || || || || || || |- | Canon EF-mount || 44.00 mm || SLR || 24×36 mm / APS-H / APS-C || 1987– || 47 || 64 || || || |- | Canon EF-S-mount || 44.00 mm || SLR || APS-C || 2003– || 2 || 9 || 0 || 0 || |- | Praktica B-mount || 44.40 mm || SLR || 24×36 mm || 1978–1990 || || || || || |- | Sigma SA-mount || 44.00 mm || SLR || 24×36 mm / APS-C || 1992– ||14 ||19 ||2 ||4 || |- | M39x1 || 44.00 mm<ref>[https://www.dpreview.com/forums/thread/4349738] Discussion of Zenit and Braun Paxette mounts</ref>||Mirrorless|| 24×36 mm || 1950s || || || || || Braun Paxette rangefinder cameras |- |Kiev Automat |44.00 mm<ref name=":1">{{Cite book |last=Reinsalu |first=Armult |title=Algajale fotograafile |publisher=Valgus |others=Reviewed by Kunnar Allikvee, artistic editor H. Puzanov, technical editor K. Kuulmann, proofreaders S. Hiie and M. Mere. |year=1987 |editor-last=Iho |editor-first=A |location=Tallinn |page=177 |language=et |trans-title=For a beginner photographer |chapter=Lisad |trans-chapter=Extras |id=https://www.librarything.com/work/10549335/t/Algajale-fotograafile |editor-last2=Kivi |editor-first2=A}}</ref> |SLR |24x36 mm |1960s-1980s |6<ref name=":1" /> |1<ref name=":1" /> | | | |- |Arri LPL |44.00 mm |cine |25.54x36.70 mm |2018- | | | | |for Arri Alexa LF |- | rowspan="2" | Minolta/Konica Minolta/Sony A-mount || rowspan="2" | 44.50 mm || rowspan="2" | SLR || 24×36 mm || 1985– || data-sort-value="62" | 42<!-- not counting prototypes (1) and upgrades (3) -->+0+17<!-- primes up to 2015-04-23 --> || data-sort-value="81" | 50<!-- not counting regular or limited-run color-only variants and prototypes (1) -->+2+13<!-- zooms up to 2015-04-23 --> || data-sort-value="8" | 6+0+2<!-- tele converters up to 2015-04-23 --> || 2+0+0<!-- mount converters up to 2015-04-23 --> || |- | APS-C || 2004– || data-sort-value="63" | 0+0+3<!-- primes up to 2015-04-23 --> || data-sort-value="80" | 0+3+13<!-- zooms up to 2015-04-23 --> || data-sort-value="8" | 0+0+0<!-- tele converters up to 2015-04-23 --> || 0+0+0<!-- mount converters up to 2015-04-23 --> || |- | Rollei QBM || 44.50 mm<ref>Bertram Hönlinger, Carl Zeiss AG (2014): All Zeiss QBM lenses were designed for 44.5 mm. The 44.7 mm value found on some US sites is wrong.</ref> || SLR || 24×36 mm || 1970– || || || || || Rollei<!-- SL-2000, 3003, SL350, SL35 -->, Voigtländer<!-- VSL 1 Mk II, VSL 2, VSL 3 --> |- | Samsung Kenox mount || 44.50 mm || SLR || 24×36 mm || 1997–2002 || 1 || 2 (3?) || 0 || 0 || Although designed in 1990s, mount is manual-focus only; lenses mount and lock on a slightly modified Minolta A-mount adapters |- | Exakta || 44.7 mm<ref>[http://www.wrotniak.net/photo/exakta/lenses.html] Wrotniak, J. Andrzej</ref>|| SLR || 24×36 mm || 1936–1969 || || || || || |- | M39x1 || 45.20 mm<ref>[http://www.zenitcamera.com/archive/history/mounts.html#z39] Zenit's mount history: M39x1/45,2</ref>|| SLR || 24×36 mm || 1952–1968 || || || || || Early Russian SLRs (Zenit) (not to be confused with M39×26tpi and M39×1/28,8) |- | M37×1 || 45.46 mm || SLR || 24×36 mm || 1952-1957 || || || || || Asahiflex I, Asahiflex IA (Tower 23), Asahiflex IIB (Tower 23/24), Asahiflex IIA (Tower 22) |- | M42×1 || 45.46 mm || SLR || 24×36 mm || 1949– || || || || || Pentacon, Pentax, Contax S, Praktica, Zeiss ZS, Zenit, many others (not to be confused with T-mount, which is M42×0.75) |- | Pentax K-mount || 45.46 mm || SLR / Mirrorless || 24×36 mm / APS-C || 1975– || 147<ref>{{Cite web|url=https://www.pentaxforums.com/lenssearch/?type=Zoom&inproduction=0|title=Zoom Lenses | PentaxForums.com|website=www.pentaxforums.com}}</ref> || 108 || 8 || 3 || Used also by some Samsung, Ricoh, Chinon, Agfa, Vivitar, Petri and KMZ (Zenit) cameras. Lens count only for Pentax-branded lenses. |- | Contax C/Y-mount || 45.50 mm || SLR || 24×36 mm || 1974–2005 || 24 || 5 || 3 || || Used by some Contax and Yashica SLR cameras |- | Petri Bayonet || 43.50 mm || SLR || 24×36 mm || || || || || ||Petri SLRs 1960-77. |- | Mamiya Z || 45.50 mm || SLR || 24×36 mm || 1980– || || || || || |- | Kodak Retina DKL-mount || 45.7 mm || SLR / Mirrorless || 24×36 mm / 28×28 mm || 1958–1977 || data-sort-value="18" | 12<!-- Schneider Kreuznach -->+6<!-- Rodenstock --> || 0 || 0 || 0 || DKL variants<!-- 3 variants for some Retina IIIS, Retina Reflex and Instamatic Reflex lenses --> used by Retina Reflex S (034), Retina Reflex III (041), Retina Reflex IV (051, 051/N), Instamatic Reflex (062), Retina IIIS |- | Voigtländer Bessamatic DKL-mount || 45.7 mm || SLR || 24×36 mm || 1958–1967<!-- 1969? --> || data-sort-value="13" | 11+2 || 1 || 0 || 0 || DKL variants<!-- Ultramatic mount is backwards-compatible, but slightly different from Bessametic mount --> used by Bessamatic, Bessamatic deLuxe, Bessamatic m, Bessamatic CS, Ultramatic, Ultramatic CS |- | Braun Paxette Reflex DKL-mount || 45.7 mm || SLR / Mirrorless || 24×36 mm || || || || || || DKL variant used by Paxette Reflex Automatic, Paxette Reflex Automatic II, Tower 33 Reflex, Tower 34 Reflex; Balda Baldamatic III; Witt Iloca Electric / Graflex Graphic 35 Electric; Wirgin Edixa Electronica / Revue Edixa Electronica |- | Voigtländer Vitessa T DKL-mount || 45.7 mm || Mirrorless || 24×36 mm || || data-sort-value="4" | 4+? || 0 || 0 || 0 || DKL variant used by Voigtländer Vitessa T; Braun Colorette (Super) II, Colorette (Super) IIB, Colorette (Super) IIL, Colorette (Super) IIBL; Wittnauer Continental, Wittnauer Professional |- | Yashica MA-mount || 45.80 mm<!-- indirectly measured --> || SLR || 24×36 mm || || || || || 1 || (measured); 230AF etc. |- | Olympus OM-mount || 46.00 mm || SLR || 24×36 mm || 1972–2002 || 38 || 14 || || || |- | Nikon F-mount || 46.50 mm || SLR || 24×36 mm / APS-C || 1959– || 213 || 117 || || || Used by some Kiev F-mount cameras. Only Nikon manufactured lenses counted. Nikon claims that there are over 400 Nikkor lens models manufactured.<ref>[https://www.nikonusa.com/en/learn-and-explore/a/products-and-innovation/nikon-f-mount.html Nikon F-Mount], nikonusa.com</ref> |- | Leica R-mount || 47.00 mm || SLR || 24×36 mm || 1964–2009 || || || || || |- | KMZ Zenit DKL-mount || 47.58 mm || SLR || 24×36 mm || 1964–1968 || 5 || 1 || 0 || 0 || Zenit/Зенит 4/5/6 "Байонет Ц", an unofficial DKL-mount variant |- | B4-mount || 48.00 mm || TV || 2/3" 3-CCD (9.6×5.4 mm) || 1992– || || || || || Mount was in use since at least 1978, wasn't officially standardized until 1992. |- | Contax N || 48.00 mm || SLR || 24×36 mm || 2000–2005 || 4 || 5 || 0 || 1<!-- NAM-1 --> || |- | Tamron Adaptall/Adaptall-2 || 50.7 mm || SLR || 24×36 mm || 1973-2006 || 14 || 29 || 3 || 26 || No camera uses Adaptall lenses natively, intended to be used with mount adapters. Many lenses have revisions, only original optical formulas are counted. |- | Arri Standard || 52.00 mm || cine || || || || || || || |- | Arri B || 52.00 mm || cine || || || || || || || |- | Arri PL || 52.00 mm || cine || || || || || || || |- | Leica S-mount || 53.00 mm || SLR || 45×30 mm || 1996– || || || || || |- | Mini T-mount || 55.00 mm || SLR || 24×36 mm || 1957–1962 || || || || || Taisei, M37×0.75 |- | T-mount || 55.00 mm || SLR || 24×36 mm || 1962– || || || || || Tamron T-400, M42×0.75 (not to be confused with M42×1) |- | YS mount || 55.00 mm || SLR || 24×36 mm || –1969 || || || || || Sigma, Upsilon, Accura, Polaris, Sun, Aetna, Beroflex, Petri, Raynox, N.P.S., Formula, Dionar, Universal, Soligor, Yashica, Spiratone. M42×0.75 (not to be confused with M42×1) Same as T-mount but with aperture coupling |- | Mamiya 6 || 56.20 mm || Mirrorless || 6×6 cm || 1989–1995 || 3 || 0 || 0 || 0 || Rangefinder camera system, flange focal distance might not be precise.<ref>[https://www.kenrockwell.com/mamiya/6.htm] Ken Rockwell's Mamiya 6 page</ref> |- | Panavision PV-mount || 57.15 mm || cine || || 1972– || || || || || 35 mm & 16 mm |- | Mamiya 7 || 59.00 mm || Mirrorless || 6×7 cm || 1995–2014 || 6 || 0 || 0 || 0 || Rangefinder camera system |- | OCT-19 || 61.00 mm || cine || || || || || || || |- | Hasselblad H-mount || 61.63 mm || SLR || 6×4.5 cm || 2002– || || || || || for Hasselblad H System |- | Mamiya 645 || 63.30 mm || SLR || 6×4.5 cm || 1975– || || || || || |- | {{Interlanguage link|Novoflex|de}} A-mount || 63.3 mm || SLR || || || || || || || (measured) "A"-type adapters for follow-focus system |- | Contax 645 || 64.00 mm || SLR || 6×4.5 cm || 1999– || || || || || |- | Zenza Bronica ETR || 69.00 mm || SLR || 6×4.5 cm || 1976–2004 || 17 || 2 || || || |- | Pentax 645 || 70.87 mm || SLR || 6×4.5 cm || 1984– || 25 || 8 || 2 || 2 || |- | Rollei SLX || 74.00 mm || SLR || 6×6 cm || 1976–2005 || || || || || |- | Pentacon Six || 74.1 mm || SLR || 6×6 cm || 1956–1992 || || || || || Used also by Exakta 66 and Kiev 60 series cameras |- | Hasselblad V-mount || 74.90 mm || SLR || 6×6 cm || 1957–2013 || || || || || for Hasselblad V system |- | Kowa Six/Super 66 || 79.00 mm || SLR || 6×6 cm || 1968–1974 || 9 || 0 || || || |- | Hasselblad 1000F & 1600F || 82.10 mm || SLR || 6×6 cm || 1948–1957 || || || || || |- | Salyut/Kiev mount || 82.10 mm || SLR || 6×6 cm || 1972–1980 || || || || || Used by Salyut-S/Салют-C, Zenit/Zenith-80, Kiev 88 cameras |- | Pentax 6×7 || 84.95 mm<ref>[https://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html] Camera Mounts Sorted by Register</ref> or 85.00 mm || SLR || 6×7 cm || 1969–1999 || 25 || 2 || 3 || || |- | Zenza Bronica SQ || 85.00 mm || SLR || 6×6 cm || 1980–2003 || 14 || || || || |- | Zenza Bronica GS || 85.00 mm || SLR || 6×7 cm || 1983–2002 || 9 || 0 || 2 || || |- | Zenza Bronica S2A || 101.70 mm || SLR || 6×6 cm || 1959–1980 || || || || || |- | Rollei SL66 || 102.80 mm || SLR || 6×6 cm || 1966–1992 || || || || || |- | Mamiya RZ || 105.00 mm || SLR || 6×7 cm || 1982– || || || || || |- | Mamiya RB || 112.00 mm || SLR || 6×7 cm || 1970– || || || || || |- | Ricoh 126C-Flex || 62.22 mm || SLR || 24×24 mm || 1968-1969 || || || || || |- |16-SP |52 mm<ref>{{Cite web |date= |title=16-SP (Krasnogorsk-2) adapters |url=https://rafcamera.com/adapters/bayonet-adapters/krasnogorsk-2 |access-date=3 May 2024}}</ref> |Cine |16 mm |1965-1991 | | | | |Used on the Soviet Kinor 16 and Krasnogorsk cameras |- |Kiev-16U |31 mm<ref>{{Cite web |title=Industar-50 KIEV 16mm lens C mount ? |url=https://forum.mflenses.com/industar-50-kiev-16mm-lens-c-mount-t53620.html#1267043 |access-date=2024-05-03 |website=forum.mflenses.com}}</ref> |Cine |16 mm | |3 | | | |Used on the Soviet Kiev-16U camera |- |1KSR-1M |57 mm<ref name=":0">{{Cite web |date= |title=Flange Focal Distances |url=http://rafcamera.com/info/ffd.htm |url-status=dead |archive-url=https://web.archive.org/web/20060518183608/http://rafcamera.com/info/ffd.htm |archive-date=2006-05-18 |access-date=2024-05-03 }}</ref> |Cine |35 mm | | | | | |Used on the Soviet Konvas-1M, 7M, Automat cameras |- |1KSR-2M |61 mm<ref name=":0" /> |Cine |35 mm | | | | | |Used on the Soviet Konvas-2M, 8M, Kinor-35 cameras |- |Vivitar TX |56.25 mm |SLR |24×36mm |1976- |10 | | |10 |Generic mount used to be attached on many cameras thanks to differents adapters |}
== Precision == {{Original research section|date=January 2025}} Flange focal distance is one of the most important variables in a system camera, as lens seating errors of as little as 0.01 mm will manifest themselves critically on the imaging plane and focus will not match the lens marks. Professional movie cameras are rigorously tested by rental houses regularly to ensure the distance is properly calibrated. Any discrepancies between eye focus and measured focus that manifest them­selves across a range of distances within a single lens may be collimation error with the lens, but if such discrepancies occur across several lenses, it is more likely to be the flange focal distance or the ground glass (or both) that are misset.
=== Film use === Due to research on optimal flange focal distance settings, it is currently considered better for flange focal distance to be set to somewhere ''within'' the film's emulsion layer, rather than on the surface of it. Therefore, the nominal flange focal depth will be equivalent to the distance to the ground glass, whereas the actual flange focal depth to the aperture plate will in fact be ~0.02 mm less.
== See also == * List of lens mounts * Lens adapter
== References == {{reflist|colwidth=30em}}
* Markerink, Willem-Jan. ''[http://www.a1.nl/phomepag/markerink/mounts.htm Camera Mounts & Registers] {{Webarchive|url=https://web.archive.org/web/20071124034629/http://www.a1.nl/phomepag/markerink/mounts.htm |date=2007-11-24 }}''. Retrieved on November 6, 2005.
Category:Photography equipment