DX (Digital indeX) is a standard for marking 135 film and APS photographic film cartridges. Cameras can electrically determine the film speed, number of exposures and exposure tolerance. The DX ''Camera Auto-Sensing Code'' takes the form of a common ground and ten areas (bits) on the cartridge surface that are either conductive or non-conductive. Electrical contacts in the camera read the bit pattern. The first 5 bits represent 32 possible film speeds. But there are only 24 speeds representing the 1/3 "stops" from 25 ISO to 5000 ISO. Likewise, 3 bits represent possible 8 film lengths, although in practice only 12, 20, 24 and 36 exposures are encoded. Finally, 2 bits give 4 ranges of film tolerance, or latitude, in ±f-stops. The full DX geometrical and electrical standard is set by ANSI and International Imaging Industry Association. == See also == * DX number == External link == * http://www.geocities.com/thombell/dx.html (Shows how to read the codes.)
See other meanings of words starting from letter:
Words begining with DX_encoding:
DX_encoding
DX encoding
DX (Digital indeX) is a standard for marking 135 film and APS photographic film cartridges. Cameras can electrically determine the film speed, number of exposures and exposure tolerance. The DX ''Camera Auto-Sensing Code'' takes the form of a common ground and ten areas (bits) on the cartridge surface that are either conductive or non-conductive. Electrical contacts in the camera read the bit pattern. The first 5 bits represent 32 possible film speeds. But there are only 24 speeds representing the 1/3 "stops" from 25 ISO to 5000 ISO. Likewise, 3 bits represent possible 8 film lengths, although in practice only 12, 20, 24 and 36 exposures are encoded. Finally, 2 bits give 4 ranges of film tolerance, or latitude, in ±f-stops. The full DX geometrical and electrical standard is set by ANSI and International Imaging Industry Association. == See also == * DX number == External link == * http://www.geocities.com/thombell/dx.html (Shows how to read the codes.)
See other meanings of words starting from letter:
D
DA | DB | DC | DE | DF | DG | DH | DI | DJ | DK | DL | DM | DN | DO | DP | DR | DS | DT | DU | DW | DX | DY | DZ |Words begining with DX_encoding:
DX_encoding
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