6mm Fixed CS Lens
The obvious advantage of fitting fixed lenses is the price. When fitting fixed lenses however, you should make sure you know exactly which focal length to use before purchasing and fitting it. The wider the aperture, the more zoomed in the image will be. A 2.8mm lens will show a wider angle image whereas a 12mm lens will show a more narrow angle but more zoomed in image.
This 6mm lens offers approxametly a 44° horizontal viewing angle on a 1/3" CCD