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Sensor size and FOV with relation to lens focal length?

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  • Sensor size and FOV with relation to lens focal length?

    MOST action cam use a 1/2.3" sensor. Combined with standard fisheye lens results in a FOV of about 120* horizontal / 170* diagonal.

    However as the industry moves to smaller form factors like RunCam, Session, etc, a lot of cameras are moving toward using a smaller sensor size 1/3.2". Now obviously to achieve the same FOV they have a different focal length lens.

    Does anyone has a calculator to see what focal lengths are using with 1/3.2" sensor size for a given FOV? Or what FOV we can expect taking a lens designed for a 1/2.3" sensor and mating it to the smaller sensor?

    Thanks.

  • #2
    In order to get effective focal length you need to multiply the lens f in mm by the sensor crop factor. FOVs are not that easy to calculate as we're talking about high-distortion fish-eye lenses...

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    • #3
      Originally posted by nutsey View Post
      In order to get effective focal length you need to multiply the lens f in mm by the sensor crop factor. FOVs are not that easy to calculate as we're talking about high-distortion fish-eye lenses...
      would it be bigger or smaller for a bigger or smaller sensor? or does lens mount change too, holding the lens at a different distance from the sensor?

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      • nutsey
        nutsey commented
        Editing a comment
        The crop factor increases for smaller sensors.
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