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Thread: Newbie question on lens

  1. #1

    Default Newbie question on lens

    How big is the different between f/1.4 and f/2.8 in term of capturing photo at low light ?

  2. #2
    Senior Member geraldkhoo's Avatar
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    Default Re: Newbie question on lens

    Quote Originally Posted by khyou99 View Post
    How big is the different between f/1.4 and f/2.8 in term of capturing photo at low light ?
    Have a read at the following...

    http://www.uscoles.com/fstop.htm
    A picture tells a thousand words... make yours speak a million!
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  3. #3

    Default Re: Newbie question on lens

    Opening up from 2.8 to 1.4 gives you 2 stops (4 times) more light.

    In the context of low light, if your shutter speed is 1/30s at f/2.8, you can shoot at 1/125s at f/1.4. Helpful for shaky hands or moving subjects.

    Or if you're worried about high ISO noise, it allows you to drop from ISO800 to ISO200 if you keep the shutter speed constant.

    [Edit]
    Note that your DOF (Depth of Field) is MUCH narrower at f/1.4, which may cause focusing issues.

    Hope it helps.
    Last edited by Aspect; 24th April 2008 at 10:35 AM.

  4. #4

    Default Re: Newbie question on lens

    Thanks for all the tips

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