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The Marshall High Resolution CCTV Lens (2.5mm, F2.5) belongs to the 4400 Series of fixed focal lenses. The lens offers a sensing area of up to 1/3-inch with an angular field of view -diagonal 142.7°, horizontal 113.4°, and vertical 85.9° - at a maximum relative aperture of 2.5 + 5%. The high resolution lens can capture images at a minimum distance of 40cm from the image plane, and has a focal length of 2.5mm + 5% and a back focal length of 5.04mm + 5% (in air).