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Film speed Wikipedia

Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to describe the relationship between .. On 1 January 1987, the GOST scale was realigned to the ISO scale with 

Escala de sensibilitat fotogràfica Viquipèdia, l'enciclopèdia lliure

L'índex d'exposició o sensibilitat d'una pel·lícula s'indica mitjançant les escales ASA, Deutsches Institut für Normung, ISO o GOST (escala soviètica actualment 

Convert GOST to ISO/ASA/DIN – kataan.org

Older Soviet cameras measured film sensitivity settings in GOST units instead of the newer ASA/ISO or older DIN speeds. The settings aren't far off, this is a table