• The three elements fo the exposure triangle are shutter speed, aperture and film speed / ISO.

    The exposure triangle

    By understanding how these three elements are interlinked you will be able to tackle any situation and make creative decisions about your exposures.

  • First of all set the correct shutter speed on the camera and lens aperture for your subject.

    Shutter speed & aperture

    Depending on the result you want to achieve the right combination of shutter speed and aperture is essential.

  • Setting the ISO can have an affect on the final look of your image, a higher ISO will result in grainer looking photographs

    Set your ISO

    By understanding the effect of changing the ISO in relation to the shutter speed and aperture settings you will have complete control of the exposure triangle.

Shutter speed

To get perfect exposures in any situation you need to understand how shutter speed, aperture and ISO are related when shooting and in the resulting photographic image.

Lens Aperture

Selecting the right aperture not only allows you to control the look of the image but moreover means you can shoot in any situation controlling the depth of field.

ISO settings

Once you have understood the basics of the exposure triangle you can achieve multiple effects in your photographs all from the same scene or subject matter.

Shutter Speed

  • Did you know that all 3 of these settings used in different combinations will give you the same exposure? For example you want to shoot a picture at 1/60s and with an ISO of 200 you get an aperture of f5.6. But what happens if the light drops and your operating shutter speed drops to 1/30s ? You then have 2 options to bring the shutter speed back up to 1/60s
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  • Choosing your shutter speed
  • Choosing your shutter speed
  • Choosing your aperture
  • Choosing your aperture


  • So the light has dropped and you cannot use 1/60s. Your 2 options are to change the the aperture or the ISO / film speed. So changing the aperture means opening up the lens by 1 stop from f5.6 to f4 thereby letting in 1 more stop of light. This in turn means that your shutter speed rises again by 1 stop allowing you to use 1/60s again.
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Adjusting the ISO

  • However you may have a very specific shot or look in mind and want to shoot at 1/60s AND f5.6 This is when you can change the ISO. We started shooting with an ISO of 200, the light has dropped and you need to use the above settings but this would under expose the image. Now you change the ISO or sensitivity by +1 stop, this means using 400asa rather than 200asa. Your exposure is perfect and you have used 1/60s at f5.6 as desired.
    Take control of the Exposure Triangle
  • Combining shutter speed and aperture for your desired effect
  • Choosing your aperture

The Exposure triangle

  • All 3 of these settings affect the other if one is changed. Changing shutter speed by +1 stop would require changing the aperture or ISO by +1 stop to get the right exposure. All 3 settings are interlinked and this is the crucial point to understand about exposures and the exposure triangle. All of these examples would give exactly the right / same "exposure" but at different settings.
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