>>4155747You're thinking of density, which is a fuction of exposure. For any given film stock you can determine the exposure it got from the density. Exposure is a radiation dose (light is radiation). This direct, bijective function is nearly universal with the exception of reciprocity failure which can happen under certain conditions usually detailed by the manufacturer as to let the photographer compensate accordingly. None of these things have anything to do with the size of the negative.Exposure is measured in lux seconds, that is luminous flux per unit of area multiplied by the time the photosensitive material is exposed to the light source. I'm honestly annoyed that I have to explain basic sensitometry to a random faggot but here we are.
