Horizontal Filed Of View (HFOV), instantaneous Field of View (iFOV) and Effective Focal Length (EFL) calculators

    Horizontal Filed Of View (HFOV), instantaneous Field of View (iFOV) and Effective Focal Length (EFL) calculators

    The following calculators compute the Horizontal Field of View (HFOV) or Effective Focal Length (EFL) of a camera and lens system, for any sensor format.

    Using the EFL calculator, enables system engineers to find a lens according to pre-determined FOV,  which will enable easy search of the relevant product within Ophir’s catalog.

    Using the iFOV calculator will enable finding the core parameter in picture resolution and target recognition.

    Upon completion of the calculation, using the final values, you will be able to search for the appropriate IR lens to meet your requirements.

    Please note that the results of the calculator are not exact, as they are based on the paraxial approximation, which does not take lens distortion into account. Errors in wide-FOV lenses could be significant.

     HFOV Calculator
    Calculate:

    Number of horizontal pixels

    Pixel pitch

    μm

    EFL

    Effective focal length in millimeters

    mm