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DX encoding
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DX encoding
DX (Digital indeX) encoding is a standard for marking 35 mm and APS photographic film and film cartridges, originally introduced by Kodak in 1983. It includes multiple markings, which are a latent image barcode on the bottom edge of the film, below the sprocket holes, a conductive pattern on the cartridge used by automatic cameras, and a barcode on the cartridge read by photo-finishing machines.
The DX encoding system was incorporated into ANSI PH1.14, which provided standards for 135 film magazines for still picture cameras and was superseded by NAPM IT1.14 in 1994; it is now part of ISO standard 1007, whose latest revision was issued in 2000.
In order to simplify the handling of 35 mm film in 135 format cartridges, Kodak introduced the DX encoding method on 3 January 1983. In contrast to the film speed encoding method developed by Fuji in 1977, which used electrical contacts for film speed detection on 135 format cartridges, 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 VR 1000 in March 1983.
The first point-and-shoot cameras to use DX encoding to automatically set film speed were released in 1984, including the Pentax Super Sport 35 / PC 35AF-M and Minolta AF-E / Freedom II. The first single-lens reflex cameras to take advantage of DX encoding were released in 1985, including the Konica TC-X SLR (1985), Pentax A3 / A3000, Minolta 7000 (February 1985) and 9000 (September 1985), and the Nikon F-301 / 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).
In 1998, Fujifilm introduced a film identification system for 120 and 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. This 13-bit barcode is optically scanned by newer medium format cameras like the Fujifilm GA645i Professional, GA645Wi Professional, GA645Zi Professional, GX645AF Professional, GX680III Professional, GX680IIIS Professional, Hasselblad H1, H2, H2F and H3D Model I with HM 16-32 as well as by the Contax 645 AF.
Next to the film exit lip is an Interleaved 2 of 5 barcode and a printed number. The six digits represent the I3A assigned DX number (middle four digits), the number of exposures (last digit) and a proprietary manufacturer's code (first digit). The DX number identifies the manufacturer, film type, and by inference, the necessary developing process type. This is used by automatic photo-finishing machines to correctly process the exposed film.
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DX encoding
DX (Digital indeX) encoding is a standard for marking 35 mm and APS photographic film and film cartridges, originally introduced by Kodak in 1983. It includes multiple markings, which are a latent image barcode on the bottom edge of the film, below the sprocket holes, a conductive pattern on the cartridge used by automatic cameras, and a barcode on the cartridge read by photo-finishing machines.
The DX encoding system was incorporated into ANSI PH1.14, which provided standards for 135 film magazines for still picture cameras and was superseded by NAPM IT1.14 in 1994; it is now part of ISO standard 1007, whose latest revision was issued in 2000.
In order to simplify the handling of 35 mm film in 135 format cartridges, Kodak introduced the DX encoding method on 3 January 1983. In contrast to the film speed encoding method developed by Fuji in 1977, which used electrical contacts for film speed detection on 135 format cartridges, 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 VR 1000 in March 1983.
The first point-and-shoot cameras to use DX encoding to automatically set film speed were released in 1984, including the Pentax Super Sport 35 / PC 35AF-M and Minolta AF-E / Freedom II. The first single-lens reflex cameras to take advantage of DX encoding were released in 1985, including the Konica TC-X SLR (1985), Pentax A3 / A3000, Minolta 7000 (February 1985) and 9000 (September 1985), and the Nikon F-301 / 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).
In 1998, Fujifilm introduced a film identification system for 120 and 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. This 13-bit barcode is optically scanned by newer medium format cameras like the Fujifilm GA645i Professional, GA645Wi Professional, GA645Zi Professional, GX645AF Professional, GX680III Professional, GX680IIIS Professional, Hasselblad H1, H2, H2F and H3D Model I with HM 16-32 as well as by the Contax 645 AF.
Next to the film exit lip is an Interleaved 2 of 5 barcode and a printed number. The six digits represent the I3A assigned DX number (middle four digits), the number of exposures (last digit) and a proprietary manufacturer's code (first digit). The DX number identifies the manufacturer, film type, and by inference, the necessary developing process type. This is used by automatic photo-finishing machines to correctly process the exposed film.
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