High-Quality CCTV Lens with a 2.8 to 12mm variable focal length, which will give you a 22.7 to 86 degree field of view.
2.8 - 12mm Varifocal Auto Iris Lens For Profession CCD Cameras
Review by Sam Adamus on Aug 25, 2013
If you purchased a box camera you are gonna need a lens and you can get one much cheaper or better than this one. It's a basic varifocal lens with a small zoom aspect (standard actually) and it does work well.
Review by Powell, Eric(Missouri USA) on Jan 15, 2013
I bought this lens because the price was cheap so I wasn't expecting too much. Man, was I wrong! this lens is amazing and my video clarity is great. Don't let this price fool you. It's a great general purpose lens.
2.8 - 12 mm Varifocal Auto Iris Lens for Professional CCD Cameras
Review by John Brookings on Nov 01, 2012
Good lens for Security Camera King's box type cameras. 2.8 to 12 mm varifocal range lets you go from a real wide angle view (86 degrees according to the specs) to a moderate zoom up of 12 mm narrowing the shot (once again from the specs 22.7 degrees). Iris is automatic. This is a geat low-cost lens for just about any box camera.
I bought this lens for my box cameras on my home system. I didn't want to go too crazy on spending so I thought I would give this lens a try. It has a good enough range from tight to wide that it works well on my cameras and it doesn't cost an arm and a leg.