The exposure triangle explains the relationship between aperture, shutter speed and ISO. These three factors are at the centre of every exposure. The shutter controls the amount of motion blur that is in your photograph, the aperture is the opening through which light passes into the camera, and the ISO is the light sensitivity. The higher the ISO means the greater the sensitivity to light, but the lower the ISO the less sensitivity to light.

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Camera Simulator

Here, we played with a camera simulator to experiment with the different elements of the exposure triangle. The photograph was taken on a sunny day, On my first attempt, I set the ISO to 400, the aperture to f/2.8 and the shutter speed to 1/600. This did not produce a successful photograph because it produced an over-exposed image due to too much light being let in.

However, for this photograph, I changed the ISO setting to 200, the aperture to f/2.8 and the shutter speed to 1/500. This photograph is more successful than my first however it is still slightly over-exposed.

In this attempt, i had set the ISO to 800, the aperture to f/4.5, and the shutter speed to 1/80. As you can see below, the photo is extremely over-exposed because too much light came into the camera. To improve this photo, I can re shoot it this with a lower ISO setting and a smaller aperture. I can also shoot with a faster shutter speed to help get the right exposure.

In my final attempt, I set the ISO to 400, the aperture to f/11 and the shutter speed to 1/25. The photograph is the most successful, although still being very slightly over-exposed.

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My photographs

In the first photograph, the exposure was higher resulting in less clarity and producing faded colours. The second photograph is slightly underexposed producing a darker photograph. The final photograph has produced the most accurate photograph for the conditions on the day although it is still slightly over-exposed.