2.5mm F1.2 1/2.5" Fixed IRIS CS Mount Lens For Security CCD Camera
These lenses are factory set for a fixed Iris lens to achieve the optimal field of view. Iris: Fixed. 1 Piece 2.5mm Fixed Iris 1/2.5" 3MP CCTV Lens. It gives you the widest field of view image available with a CS mount lens.