The three-legged stool of a properly exposed photograph is built upon a combination of aperture, shutter speed, and ISO.
When I say “properly exposed” I don’t necessarily mean the technically optimum exposure; the exposure that gives you a nice, even histogram with solid peaks in the midtone range. Because, frequently, the “proper” exposure in a photo is nothing like the technically accurate one. A determination of what’s proper can only be made by the photographer, not the camera.
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