How is film optimized for exposure at speeds in either daylight or tungsten light?
EINHAUS: The less complicated part of that question is how we optimize films for exposure at different speeds. The answer is that we use smaller silver halide crystals to manufacture slower films. That makes them less sensitive to light or slower with a finer grain structure. The difference between films that are optimized for exposure in tungsten light versus daylight is the relative sensitivity to red and blue. We change the balance to accommodate the different amounts of red and blue energy in the light sources, which helps to make the images look and feel natural. QUESTION: How are those adjustments made with digital cameras? EINHAUS: The cinematographer adjusts the red, green and blue channels to mimic what is done by selecting different film speeds that are balanced for exposure in tungsten or daylight. In some cameras this can also be done automatically. It is referred to as ‘auto white balancing.’ This can be problematic in some cameras because there is a limit to how much you
