I've looked far and wide but i cannot find the answer for this question.
I know some older cameras and lenses used to have aperture rings on them, which allowed the user to set how open or closed the aperture is at any given moment. Now, on modern DSLR lenses, the aperture only closes when the shutter release button is pressed, and to view what your shot would be like with the aperture closed you must hold the Depth of Field preview button.
I know video lenses always have a ring to control the iris- really the same function as the aperture on a DSLR camera. Why don't modern DSLR lenses have aperture rings that allow the user to set an aperture and leave it? Why does the aperture only close to the stop that it is set for when the shutter release is pressed?
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