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Math Help - Help with simple goniometrics

  1. #1
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    Help with simple goniometrics

    Hi heres my problem -

    tan(α/2) = (l/2)/d, hence
    α = 2*atan(l/2d)


    with this formula I can calculate the horizontal field-of-view of my camera.



    I found it at this site - Determining the viewing angle of your camera


    Only I havent a scientific calculator or the where with all to solve this!



    I need to find a - the angle of view.
    I know that l is the width - 2290mm
    and I know that d is the distance - 5000mm


    Any help from your forum members would be great! please save me any more days trawling endless websites trying to make sense of this!


    Thanks
    JayT









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  2. #2
    Pim
    Pim is offline
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    Is your problem that you don't know how to compute this, or that you don't have a scientific calculator.
    You can enter this in google: 2*atan(2290/(2*5000)) and Windows has a built in calculator, which you can expand using the "Scientific" option.
    The answer you'll get is in radians, which you can convert to degrees by multiplying it by \frac{360}{2\pi}
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  3. #3
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    IN google I got the answer25.7966711

    I will see how this suits thanks for the help
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  4. #4
    Member grgrsanjay's Avatar
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    yea the answer you got is right
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