A message from Bes Haskell contained: >B&W film is digital. If a silver halide crystal receives 4 photons [...] The crystal is digital but the emulsion isn't. Other than CCDs and the retina, the emulsion has not a mono layer of receptors and has no defined 'area per receptor'. Thus you have a possible superposition of different black-is-on states (= developed crystals) for every place in your emulsion, resulting in different possible grey shades for every light path through you negative. I would not call that digital. Regards, Axel - Please: Stay on topic. Trim quoted messages. http://www.leben.com/lists for list instructions.