> Also, how does this even work on a digital camera? It’s signal gain of the sensor. “In digital camera systems, an arbitrary relationship between exposure an

> Also, how does this even work on a digital camera? It’s signal gain of the sensor. “In digital camera systems, an arbitrary relationship between exposure and sensor data values can be achieved by setting the signal gain of the sensor. (…) For digital photo cameras ("digital still cameras"), an exposure index (EI) rating—commonly called ISO setting—is specified by the manufacturer such that the sRGB image files produced by the camera will have a lightness similar to what would be obtained with film of the same EI rating at the same exposure.” Source: https://en.m.wikipedia.org/wiki/Film_speed#Digital_camera_ISO_speed_and_exposure_index https://en.m.wikipedia.org/wiki/Film_speed#Digital_camera_IS...