ISO 20859:2005 Preview
Cinematography - Spectral response of photographic audio reproducers for analog dye sound tracks on 35 mm film
This standard was last reviewed and confirmed in 2018. Therefore this version remains current.
ISO 20859:2005 specifies the spectral response of the photographic audio reproducer light source and receptor as a unit, including any optical filtering that can be interposed.
The analog sound track formats suitable for reproduction using such a reproducer include the cyan dye-only track (without redevelopment of silver) and both conventional and "high magenta" soundtracks (with redevelopment of silver).
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