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Thread: Difference focal length but the same angle of view

  1. #1
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    Difference focal length but the same angle of view

    I noticed that some lenses have deference focal length but produce the same angle of view. I don't get how it is possible.
    For example:
    Schneider Apo - digitar 4.0/80 L produces AOV of 53deg
    Schneider Apo - digitar 4.5/90 N also produces the same AOV
    Schneider Apo - digitar 5.6/100 N the same also.

    Rodenstock HR Digaron-W 5.6/90 produces AOV of 70deg.

    How can it be possible?

  2. #2
    Senior Member ErikKaffehr's Avatar
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    Re: Difference focal length but the same angle of view

    Hi,

    AOV same but for what image circle or what format?

    Diagonal, horisontal or vertical?

    Best regards
    Erik


    Quote Originally Posted by TsurTriger View Post
    I noticed that some lenses have deference focal length but produce the same angle of view. I don't get how it is possible.
    For example:
    Schneider Apo - digitar 4.0/80 L produces AOV of 53deg
    Schneider Apo - digitar 4.5/90 N also produces the same AOV
    Schneider Apo - digitar 5.6/100 N the same also.

    Rodenstock HR Digaron-W 5.6/90 produces AOV of 70deg.

    How can it be possible?
    Last edited by ErikKaffehr; 18th September 2016 at 02:35.

  3. #3
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    Re: Difference focal length but the same angle of view

    You answer to my question.
    That is tricky, I thought that might be a parameter that makes the difference, like IC but I don't was sure.
    Yes, you are right. The AOV is related to the IC and not to "common" format.

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