Understanding the creative aspect of lens aperture

We all learn in Photography 101 that the aperture setting is a physical property of the lens, and you can vary its size to control the amount of light entering your camera. Usually, we think of aperture as it relates to the rules of exposure.

Back when I was shooting film and early digital cameras, it was considered ideal to have a “fast” lens (meaning one with an aperture of f/2.8 or wider). Why? because with limited ISO options (remember film rarely was faster than ISO 800 and early DSLRs got noisy in a hurry above ISO 400), a fast lens meant you could shoot hand-held in dim conditions without a flash.

Today, ISO no longer limits most photographers. Sure, images are still cleaner and have greater dynamic range at a camera’s base ISO, but you can shoot above ISO 6400 these days pretty much with impunity. That means you have much more creative latitude to choose the aesthetic of your shots by varying the lens aperture.