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With the introduction of true day/night cameras, CCTV cameras have become more versatile - and now lenses must match the wide range of light conditions covered by those cameras. (Infrared) corrected lenses provide fully adjusted and sharp focused images in daylight and at nigh when used in conjunction with IR illuminators. This makes IR lenses the best choice for high performance true day/night cameras.
The IR range includes 1/3-inch and 1/2-inch format lenses. The 1/3-inch lenses are used exclusively for 1/3-inch type cameras. The high design standards of the 1/2-inch lenses make them a perfect match for both 1/3-inch and 1/2-inch type cameras. When used with 1/3-inch type cameras, the 1/2-inch lenses provide a more "telephoto" effect.
For auto iris control, all lenses use the standard fourpin EIAJ connector, which fits directly into the camera's iris output. Varifocal lenses are DC iris direct drives, while zoom lenses have Video-iris drives.
For zoom focus and pre-position control, the lenses are fitted with an 8-pin DIN connector. The 18x zoom lens also features manual iris override. Impressive optical quality is a result of ED glass elements, aspherical lenses, and multi-layer coatings. These lenses maintain focus to IR wavelengths of 950 nm.
The mechanical construction is robust enough to withstand frequent control operations of the iris, zoom, and focus functions.