Historical
ISO 13653:1996
Optics and optical instruments - General optical test methods - Measurement of relative irradiance in the image field
Applies to optical imaging systems in the optical spectral region from 100 nm to 1 m. Telescopic systems are also included. The standard refers to the relative irradiance in the image field, but it is also applicable to determination of the relative radiant power.
International Organization for Standardization [iso]