Understanding The ‘F’ Stop

The ‘f’ stop is one of the fundamental concepts of photography. How much light you let into your camera on pressing the shutter button is set by the aperture size. In the photograph (above) the black circular gap in the centre of the lens is the aperture. Surrounding it is the iris… you can just see the sliders. The iris controls the size of aperture. Each time you change the ‘F’ setting you are going up or down a stop or fraction of a stop. The iris opens up the aperture or makes it smaller.

Each time you go up or down an ‘f’ stop you are doubling or halving the amount of light that gets through to your camera sensor. The following video explains the way that this works and some of the terminology behind the idea…Via Petapixel External link - opens new tab/page

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