Free Camera Sensor FOV Calculator

Calculate the field of view of a camera sensor attached to a telescope: FOV = 2 * atan(sensor_size / (2 * focal_length)) converted to degrees.

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mm
mm

Field of View

1.3464 deg

FOV (arcmin)80.78 arcmin

Field of View vs Sensor Dimension

View formula & how it works →

Camera Sensor Field of View

The angular field of view determines how much sky the sensor captures.

Formula

FOV = 2 arctan(d / 2f)

  • *d* = sensor dimension (width or height) in mm
  • *f* = telescope focal length in mm

    • Convert from radians to degrees by multiplying by 180/pi.

    Example Calculation

    APS-C sensor (23.5 mm width) on a 1000 mm focal-length scope.

    1. 01FOV = 2 * atan(23.5 / 2000)
    2. 02FOV = 2 * atan(0.01175)
    3. 03FOV = 2 * 0.01175 rad = 0.02349 rad
    4. 04FOV = 0.02349 * 180 / pi = 1.346 degrees

    Frequently Asked Questions

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