The Exposure Triangle
Whether you shoot in automatic or one of the other modes in your camera, it is important to understand ‘Exposure.’ Basically, exposure is how bright or dark your image is and is controlled by three things, namely: aperture, shutter speed and ISO. So, let’s start by looking at the definitions of the above.
Aperture or f-stop refers to the size of the opening where light comes into the lens. The larger the hole, the larger the aperture and the smaller the number eg: f/2.8. The smaller the hole, the smaller the aperture and the bigger the number eg: f/18. So, the larger the hole, the more light will come in and the brighter your image will be. Aperture is also a huge tool in photography as it determines your depth of field (what is in focus and what isn’t). The bigger the aperture is, the shallower your depth of field. And vice versa. The example on the left was shot at f/5.6 and as you can see, the chameleon is in focus, but his background is blurred. On the right, I used an aperture of f/11 to get more of the pride in focus.