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Writer's pictureKelly-Anne Jones

The Exposure Triangle

The exposure triangle is the three pillars of photography:

- Aperture

- ISO

- Shutter Speed

Understanding Aperture:

- Aperture adds life like or realistic qualities by blurring the background of a photograph or by bringing everything into focus

- Aperture is best described an understood through the explanation of the pupil in our eye.

The larger our pupil is equivalates to the more light we have entering our eye indicating that the larger aperture on the camera the more light entering the lens.

- Aperture is expressed in f-numbers/f-stops. A smaller f-number equals a larger aperture where as a larger f-number equals a smaller aperture for example f/1.4 is greater than f/2.0.

- Depth of field is the area of image that appears sharp

- A smaller aperture allows you to focus the foreground and background of your photograph

- A larger aperture allows you to focus the foreground and blurred the background of your photograph

Understanding ISO:

- ISO is described as the cameras level of sensitivity to light.

- The lower the ISO the less sensitive the camera is to light. You should set your ISO lower when shooting in a location with plenty of natural light however if shooting in a dark/dim location with a lower ISO it is advised you use a tripod to avoid grainy photographs

- The higher the ISO the more sensitive the camera is to light. You should set your ISO higher when there isn't much natural lighting, you're shooting indoors or trying to capture moving objects.

- The ISO Sequence increases by the power of 2, doubling the sensitivity each time and halving the time to capture your photography - 100, 200, 400, 800

- The less time taken to capture can avoid shake or blur but add grain or noise to your photographs.


Understanding Shutter Speed:

- Shutter speed indicates the length of time a camera shutter is open, exposing light to sensor, once you click to capture your photograph.

- A fast shutter speed will freeze action where as a slow shutter speed will create a motion blur which is ideal when capturing photographs of landscapes (waterfalls/ rivers), moving objects (cars/ bikes) and lightening.

- Shutter speed is measured in fractions of a second indicating that 1/4 is a quarter of a second and 1/250 is 250 of a second also known as 4 milliseconds.


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