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Thread: F number

  1. #1

    Default F number

    Hi ,

    I have read abt the small the f number the opening is bigger n allow more light to come in.
    Is tat means i always set n smallest n buy lens with small F number?

    Pls advice

  2. #2
    Senior Member giantcanopy's Avatar
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    Default Re: F number

    Quote Originally Posted by cklingkwok View Post
    Hi ,

    I have read abt the small the f number the opening is bigger n allow more light to come in.
    Is tat means i always set n smallest n buy lens with small F number?

    Pls advice
    True. A lens at f1.4 will allow double the amount of light compared to f2. ( varying by a factor of root two )

    The aperture you want depends on what you are trying to achieve. Apart from varying the amount of light, a smaller aperture size gives for more depth of field and more things will be in focus as well.
    A larger aperture size gives more light, and the option of using a faster shutter speed to freeze motion; likewise a smaller aperture can reduce light, allowing you to use a longer shutter speed to create motion effects like a silky flowing river without the risk of overexposure. These are just some basic examples. You will need to read up on the interplay of shutter speed / aperture / ISO and metering concepts to have a meaningful understanding of exposure. There are many resources online.

    Lenses with large aperture size / smaller f numbers are generally more pricey / heavier than their counterparts. Get what you need and within your budget.

    Ryan
    Last edited by giantcanopy; 12th November 2008 at 06:51 PM.

  3. #3
    Senior Member zac08's Avatar
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    Default Re: F number

    Read this and you'll understand better

    Photography Notes For Newbies
    Michael Lim
    My Flickr Site

  4. #4

    Default Re: F number

    Thanks for the advices.

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