Editing DX encoding (section)

== History ==
[[File:Kodak 400 color film DX code.jpg|left|thumb|Codes on Kodak ISO 400 color negative film]]
In order to simplify the handling of 35&nbsp;mm film in 135 format cartridges, Kodak introduced the DX encoding method on 3 January 1983.<ref name="Kodak_1983_Press1"/><ref name="Kodak_1983_Press2"/> In contrast to the [[film speed]] encoding method developed by [[Fuji (company)|Fuji]] in 1977,<ref name="Fuji_Patent_4024557"/> which used electrical contacts for film speed detection on 135 format cartridges,<ref name="AP_1977_Fuji"/> Kodak's DX encoding system immediately met success in the marketplace.

The first DX encoded film to be released was the [[color print film]] [[Kodacolor (still photography)#Kodacolor VR 1000|Kodacolor VR&nbsp;1000]] in March 1983.

The first [[point-and-shoot camera]]s to use DX encoding to automatically set film speed were released in 1984, including the [[Pentax]] Super Sport 35&nbsp;/ PC 35AF-M<ref name="Pentax_PC35AF-M"/> and Minolta AF-E&nbsp;/ Freedom II.<ref name="Minolta_AF-E"/> The first [[single-lens reflex camera]]s to take advantage of DX encoding were released in 1985, including the [[Konica Autoreflex|Konica TC-X]] SLR (1985),<ref name="konfiles-TCX">{{cite web |url=http://www.konicafiles.com/slr-bodies/-konica-tc-x-1985/ |website=konicafiles.com |title=Konica TC-X (1985–1988) |access-date=7 November 2020}}</ref> Pentax A3 / A3000,<ref name="Pentax_A3000"/> [[Minolta 7000]]<ref name="Minolta_7000AF"/> (February 1985) and [[Minolta 9000|9000]] (September 1985), and the [[Nikon F-301]] / [[Nikon N2000|N2000]].

''DX-iX'' (data exchange - information exchange) is an expanded DX encoding system introduced in 1996 which was released as part of the [[Advanced Photo System]] (APS), which use a different cartridge and film size, also known as IX240 film. APS film and cameras were marketed with numerous brand names, most including an "ix" to emphasize the information exchange aspect, including Advantix (Kodak) and Nexia (Fujifilm).

{{anchor|Barcode System}}In 1998, [[Fujifilm]] introduced a film identification system for [[120 film|120]] and [[220 film|220 format]] [[roll film]] called ''Barcode System'' (with logo "|||B"). The [[barcode]] encoding the film format and length as well as the film speed and type is located on the sticker between the emulsion carrying film and the backing paper.<ref name="Paul_2008_Fuji-Barcode"/><ref name="Fujifilm_5845869"/><ref name="Fujifilm_6050489"/><ref name="Fujifilm_6208812"/><ref name="Fujifilm_6052538"/> This 13-bit barcode<ref name="Paul_2008_Fuji-Barcode"/><ref name="Fujifilm_5845869"/><ref name="Fujifilm_6050489"/><ref name="Fujifilm_6208812"/><ref name="Fujifilm_6052538"/> is optically scanned by newer [[medium format]] cameras like the Fujifilm GA645i Professional, GA645Wi Professional, GA645Zi Professional, GX645AF Professional, [[Fujifilm GX680III Professional|GX680III Professional]], [[Fujifilm GX680IIIS Professional|GX680IIIS Professional]], [[Hasselblad H1]], [[Hasselblad H2|H2]], [[Hasselblad H2F|H2F]] and [[Hasselblad H3D|H3D]] Model&nbsp;I with HM&nbsp;16-32 as well as by the [[Contax 645&nbsp;AF]].<ref name="Paul_2008_Fuji-Barcode"/>