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. ktzdaman

    Sierra 6 sig Sauer bdx question - lens caps!!!

    I purchased the 2x12 and the 5x30 Sierra 6 bdx scopes. They don’t come with lens caps. I’ve searched around and am having no luck. Anyone know of a set that will fit them? Thank you in advance!
  2. Vorpalis

    Sacrificial window for scope's objective lens.

    Does anyone know if a sacrificial window, or something like a UV filter for camera lenses, is available for rifle scopes? I'm mounting a Sig Tango 6 3-18x44 on a bullpup, and with proper eye relief the objective lens is just behind the muzzle brake, so I'd like to protect the lens. I've done...
  3. 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.
  4. WardogWoodcock

    Favorite scope caps/ lens covers for protecting your glass

    Comment below
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