IC Realtime 600TVL License Plate Capture Camera (ELID1) - Manual (Page 7)

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Mounting the EL-ID1
Mounting the EL-ID1 in an ideal location will ensure consistency of license
plate capturing during all weather and lighting conditions. The EL-ID1
camera has a 16mm omni-focus lens. This will output a video signal with a
horizontal FOV (Field of View) of 17.06° and a vertical FOV of 12.84°. The
EL-ID1 is effective from a 15-25ft range. Though, optimal distance from the
camera to the capture point is 18ft. This will result in a capture width of 5.4ft
and a height of 4.1ft. For greater consistency also make sure the camera does
not exceed a horizontal or vertical angle greater than 40° from the car’s
license plate. Mounting the camera at a greater angle will result in
inconsistency and fewer legible characters on the license plate. Even though
40° is the maximum mountable angle the ideal location would be closest to
0° from the car on both horizontal and vertical angles. See the diagram
below for mountable angles.