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We did a good practical exercise in class this week. Setting Aperture priority and the widest setting (f1.8 in my case), and setting Shutter to 1/125, take 3 shots with ISO set to Auto in (a) well lit classroom, (b) dim corridor, and (c) darkroom under red light, and note the ISO that was used in each case to obtain a passable image. It was quite a good demo of both the usefulness of variable ISO setting but also the noise/grain that comes with it. We did a similar thing with each aspect of the exposure triangle to demonstrate the effects of each element. Nothing new for me, but a good reminder and fun exercise.
What was the upper ISO limit -- if any?
