----- Original Message ----- From: "Markus Maurer" Subject: RE: digital cameras and filter use
> Hi William > your answer of course raises my next question :-) > why is there a limit of ISO 200, and what is the maximum then, 1600? > Is this only a limit of the Pentax *istD or do all digital cameras have this > limitation. You'd have to talk to the fine people at Pentax to answer the first part of your question. I suspect that you will find that the answer is that they can only engineer so much latitude into the sensor's sensitivity, and most people want faster, not slower. > And to stay on that topic, is the (quality) grain or whatever difference > with ISO settings the same > digitally as on real film? With film, grain size increases as film speed increases. With digital, noise levels increase as the sensitivity is turned up. The two are somewhat analogous. William Robb
