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Camera Lens Field of View (FOV)

27 Jun 2022

Field of view (FOV) is defined as the maximum area that a device can capture. The larger the field of view, the more data can be captured at one time, so it will require fewer images to capture an entire target.

FOV is specified in one of two ways: angular field of view and sized field of view (object size at a specific working distance).

  • Angular Field of View (AFOV) is typically specified as the full angle in degrees.
  • Sized/Length Field of View (object size) is typically specified as the length in millimeters or meters.

The lens focal length and sensor size both factor into determining the FOV. Assuming the lens focal length is fixed, the larger the sensor, the larger the required FOV.

Though camera FOV can be measured horizontally, vertically, or diagonally, it is more commonly measured horizontally, as most sensors are rectangular. This measurement is typically expressed in millimeters.

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