DX Encoding

DX Encoding (Digital indeX) is a marking standard for 35mm and APS film cartridges for cameras to electronically determine the speed, number of frames and exposure tolerance of the loaded film through Camera Auto Sensing (CAS).

History

DX Encoding on 35mm film was introduced in the 1980's, APS adopted the technology when released in 1996.

Sources and external links

Shows how to read the codes manually

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