A type of lens that enables a manual selection between two focal lengths, to give the desired picture view. A good option for customers, who are unsure of angle or distance, as it saves having to try multiple lenses.
Is one type of lens found on some cameras. This lens allows the user / installer to manually adjust the camera's field of view. Varifocal lenses can therefore be changed to provide wider viewing angles or narrower telephoto viewing angles. Because of their adjustability, varifocal lenses are great when a camera will serve more than one purpose or to ensure proper focus without first determining an exact fixed lens focal length. Varifocal lenses are also typically referred to as zoom lenses. Video Input Type refers to the type of video a device will accept for display, recording, etc. AutomatedSurveillance.com equipment (just like the majority of consumer video equipment most clients have at home) is made for compatibility with composite video. For use with S-Video, RGB component video, VGA, or other specialized / digital video formats, an adapter or converter may be required.
Is a type of manual zoom lens with a small zoom ratio (ranging between 4mm to 12mm depending on brand). It is used when the focal length of the lens needs to be fine tuned to meet the requirements of the actual scene.