What is “Exposure”?
We’ve all taken them – an amazing once-in-a-lifetime photo but when we look closer, the photo is too dark or too bright or the subject doesn’t pop enough. A properly “exposed” photo will show details in both the lighter and darker areas of a photo AND show the subject and background in proper focus.
Exposure can be defined as the amount of light that enters the front of the lens and hits the sensor of your camera.
There are 3 elements that determine the correct Exposure and they are heavily dependent on each other – ISO, Shutter Speed and Aperture. There are many combinations of these 3 elements that can produce a correctly exposed photo BUT the “effect” of each combination will drastically impact the creative look of the photo. Let’s look at each element.
ISO = Film speed
If you’re old enough to remember using a film camera, you would have bought various “speeds” of film depending on the lighting conditions you were shooting in. ISO determines how sensitive the camera is to incoming light.
Today’s digital cameras allow you to adjust the ISO (aka film speed) either through an ISO dial or through the menu system. The downsides of using a high ISO is that the photo will become “grainy” or noisy. It might be properly exposed but it will not be as sharp.