Remember that a "Zone" is a uniform density or "tone". A single tone has no texture. In the context of typical Zone System testing, usage etc, where (for example) "Zone III" is supposed to have full detail, is often helpful to think of Zone III as an average of all the different tones that together would show textured sandstone. A detailed/textured Zone III, therefore must contain minute areas of varying density - probably ranging from at least Zone II to Zone IV, and probably wider than that. So, to get a good detailed Zone III, you need to make sure there is good contrast between all the Zones below and above it. The "speed" point of your film is therefore typically one that ensures there is good contrast from below Zone I upward.
Originally Posted by Alex Muir
Last edited by Michael R 1974; 01-15-2013 at 10:46 AM. Click to view previous post history.