Saturday, October 29, 2011
What is Reciprocity Failure?
Blog by Mat Marrash
Whether you’re using a lower speed film in daylight, trying to maximize your depth of field in a landscape, or just setting up the camera for an exposure at night, sooner or later you’re going to start pushing the limits of your film’s light gathering ability. As light becomes more scarce, the silver halide grains residing in your film will be less uniformly struck by photons, causing a steep drop in density after a few seconds of needed exposure. This exponentially diminishing response to low light levels is more popularly known as a film’s reciprocity failure. Not all films are created equal, and some will respond better than others, but here’s what you can typically expect...
Read More: http://filmphotographyproject.com/content/howto/2011/10/what-reciprocity-failure