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Thread: How can a lens be faster than f1?

  1. #1
    arith's Avatar
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    How can a lens be faster than f1?

    Well these say this is. Is there anything faster?

    http://en.leica-camera.com/photograp...nses/5915.html

  2. #2

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    Val Mansfield

    Re: How can a lens be faster than f1?

    The Canon 7 claimed a 50 mm f 0.95 lens when it was introduced in 1961.

    For a 50 mm lens to be f 0.95 the effective maximum diameter of the aperture must be 52.63 mm.

  3. #3
    arith's Avatar
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    Re: How can a lens be faster than f1?

    I see, so just wider than the focal length.

  4. #4

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    Remco

    Re: How can a lens be faster than f1?

    Quote Originally Posted by arith View Post
    I see, so just wider than the focal length.
    Yes, as the F-number is the focal length of the lens divided by the diameter of the diaphragm

  5. #5
    arith's Avatar
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    Re: How can a lens be faster than f1?

    I was just interested since I read the exif of a friends pic of a duck to find 1000mm @f8 on a canon 1D, so I went looking and found that strange thing on the way.

  6. #6
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    Kathy Li

    Re: How can a lens be faster than f1?

    Quote Originally Posted by arith View Post
    Well these say this is. Is there anything faster?
    Well, there are those Zeiss f/0.7 lenses that Kubrick used for Barry Lyndon.

  7. #7
    arith's Avatar
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    Re: How can a lens be faster than f1?

    Definitely Kathy. I didn't ever imagine anything like this could exist.

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