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    • Simple and Accurate Method for Determining Lens Focal Length

    Jose Sasian

    Optical Engineering（2023）

    Univ Arizona

    Cited 2|Views2
    Abstract
    Abstract. A simple and accurate method for determining the focal length of a lens is presented. There is no need to know the distance between lens principal planes and can be performed with easily available and inexpensive hardware. Depending on the test lens (TL) f-number, the error on determining focal length can be in the order of 0.1% of the focal length. We discuss determining focal length with the Newton equation f2  =  zz  ′  , with the Bessel equation f  =    (  (L  −  PP)2  −  D2  )    /  4  (  L  −  PP  )  , with equation f2  =  y  ′    (  y  +  y  ′    )  , or with equation f  =    (  y2  −  PP2  )    /  4PP.
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    Key words
    focal length,autocollimation,optical bench,focus measurement
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