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Thread: 50mm focal length

  1. #1

    Default 50mm focal length

    It is said that the 50mm focal length is the closest focal length to that of the human eye.

    Is it still relevant in the digital age with our 1.6X, 1.5X field of view crop factor?

  2. #2

    Default Re: 50mm focal length

    i dont know exactly how close it is, my lens book says so too. its 50mm on FF. so i guess 35 on a DSLR.

    i havent tried a 35mm but the 50mm i tried this afternoon got me pretty close to what my eye sees..

  3. #3

    Default Re: 50mm focal length

    not quite - 50mm on the APS sensor is a 75mm equivalent with the crop factor. Perspective changes slightly.

  4. #4
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    Default Re: 50mm focal length

    50mm isnt the field of view of the human eye.

  5. #5
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    Default Re: 50mm focal length

    Someone should sticky the previous thread that had a long biological explaination on what our eye can and cannot see. And how 50mm actually has no real relation to our biological makeup.

  6. #6
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    Default Re: 50mm focal length

    Quote Originally Posted by mysum View Post
    It is said that the 50mm focal length is the closest focal length to that of the human eye.

    Is it still relevant in the digital age with our 1.6X, 1.5X field of view crop factor?
    The '50mm' approximation comes from the fact that 35mm film (aka 'full-frame') has a diagonal of 43mm, and a lens with that focal length would produce an image of least distortion, also popularly (ie conveniently, albeit erroneously) known as 'what the eye sees'.

    The concept transfers itself to any format. For 1.6x crop, the diagonal of the sensor is ~27mm, and a 28mm lens would provide 'closest focal length of the human eye'.


    HTH.


    p/s to get the diagonal of any format, use pythagoras theorem on the sensor's/film's length and width.
    Last edited by ST1100; 23rd April 2007 at 12:12 AM.

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