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A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called lenses, such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses.

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  1. tac

    Unertl lens cap lost!!!! HELP!!

    Somehow I've managed to lose the front lens cap for my 2" Varmint scope with calibrated head. My usual go-to man, Dewayne Greiner, is declining to respond to my emails, so I'm in a bit of a fix right now. Any suggestions of a clean and wholesome nature would be much appreciated. TIA.
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