V
Verre Vrai
Guest
The reciprocity law states that Exposure = Intensity X Time. Intensity is the amount of light, and Time refers to how long that amount of light is allowed to act on the films emulsion. Intensity is generally controlled by the aperture and time is generally controlled by the shutter speed. The reciprocity law therefore means that an exposure provided by 8 and 1/250 sec will gave the same results as 11 and 1/125 sec., or 16 and 1/60 sec., and so on. If one choice of settings provides proper exposure, then the others will as well. The law fails, however, when slow shutter speeds change the films apparent speed characteristics, making it seem to have a slower speed and produce color shift.
What about digital photography where no film is used. So far, I have not encounter RF yet though I do a lot of night photography.
What about digital photography where no film is used. So far, I have not encounter RF yet though I do a lot of night photography.