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Thread: Why do people label large aperture lens as fast lenses?

  1. #1
    Member leowyien's Avatar
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    Default Why do people label large aperture lens as fast lenses?

    Why do people label large aperture lens as fast lenses Do they autofocus faster? If so due to wad reasons?
    indie

  2. #2

    Default Re: Why do people label large aperture lens as fast lenses?

    With a larger aperture, it allows more light to go in and hence, the ability to use a faster shutter speed.

  3. #3
    Member leowyien's Avatar
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    Default Re: Why do people label large aperture lens as fast lenses?

    Oh! Thx!
    indie

  4. #4

    Default Re: Why do people label large aperture lens as fast lenses?

    Also because large aperture lenses cost so much that your wallet and bank account empty out very FAST!

  5. #5
    Member Dylan1987's Avatar
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    Default Re: Why do people label large aperture lens as fast lenses?

    Quote Originally Posted by Dream Merchant View Post
    Also because large aperture lenses cost so much that your wallet and bank account empty out very FAST!
    well said the cheapest fast lens that still retain your wallet is 50mm f1.8

  6. #6
    Member leowyien's Avatar
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    Default Re: Why do people label large aperture lens as fast lenses?

    Quote Originally Posted by Dream Merchant View Post
    Also because large aperture lenses cost so much that your wallet and bank account empty out very FAST!
    LOL! Haha
    indie

  7. #7
    Moderator catchlights's Avatar
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    Default Re: Why do people label large aperture lens as fast lenses?

    Quote Originally Posted by Dylan1987 View Post
    well said the cheapest fast lens that still retain your wallet is 50mm f1.8
    compare to the 50mm f1.2 and 50mm f1.4, the 50mm f1.8 not really consider a fast lens in it category.
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  8. #8
    Senior Member Anson's Avatar
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    Default Re: Why do people label large aperture lens as fast lenses?

    Quote Originally Posted by Dream Merchant View Post
    Also because large aperture lenses cost so much that your wallet and bank account empty out very FAST!
    Esp if there is a L in it..

  9. #9

    Default Re: Why do people label large aperture lens as fast lenses?

    First, a camera will focus faster as the aperture is larger during focusing which allow more light to enter. In this case you might read before slow lens hunting for focus.

    Second, since it allow more light. You can shoot at a faster shutter.

    Quote Originally Posted by leowyien View Post
    Why do people label large aperture lens as fast lenses Do they autofocus faster? If so due to wad reasons?
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  10. #10

    Default Re: Why do people label large aperture lens as fast lenses?

    Quote Originally Posted by Dream Merchant View Post
    Also because large aperture lenses cost so much that your wallet and bank account empty out very FAST!
    LOL, quote of the day

  11. #11
    Senior Member giantcanopy's Avatar
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    Default Re: Why do people label large aperture lens as fast lenses?

    Quote Originally Posted by DonnyDan View Post
    First, a camera will focus faster as the aperture is larger during focusing which allow more light to enter.
    there are exceptions though .. the 85Lmki/ii is pretty slow compared to its f1.8 cousin ..

  12. #12

    Default Re: Why do people label large aperture lens as fast lenses?

    cos when you use large aperture lenses, the faster the xmm will throw out a victory sign.

  13. #13

    Default Re: Why do people label large aperture lens as fast lenses?

    big lens and xmm doing victory signs sound wrong.

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