The Exposure Triangle sounds like the name of a complex spy novel, but in reality this is the term used for the three fundamental elements of exposure: aperture, shutter speed and ISO. Our latest photography cheat sheet illustrates the Exposure Triangle and how it affects your camera settings.
aperture
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.
shutter speed
When you shoot in Aperture Priority mode, you set the lens aperture, while the camera automatically sets the shutter speed. There are two ways to manually set the shutter speed By setting the camera to Shutter Priority mode, where you set the shutter speed and the camera automatically selects the aperture.
ISO
in very basic terms, ISO is the level of sensitivity of your camera to available light. The lower the ISO number, the less sensitive it is to the light, while a higher ISO number increases the sensitivity of your camera.