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What is F-Stop?

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  • What is F-Stop?

    I've read several articles explaining what it is, but I still don't get it. Can anyone explain it in lamens' terms?
    Thanks,
    A.M.

  • #2
    basicly its how wide the opening in the lens is, wich determines a)how much light gets in and b)the depth of field(amount of area in the pic that is in focus).
    The more its open, the more light comes in and the fasteer you can expose the pic, but you get less depth of field. as you close it(and increase the F/ number), less light comes in but the field depth goes up, and it will take longer to get a proper exposure.

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    • #3
      e.g.

      f/22 = very small hole
      f/8 = small hole
      f/1.4 = very large hole

      Each 'stop' halves/doubles the amount of light being let in through the lens (depending on which way you are going)

      Try experimenting using the Depth of Field preview button (if you have an SLR) and you can see the blades move in the lens

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