The lens is suited for high quality image capturing and the special optic glass makes it ideal for color and day/night cameras. This high-accuracy aspherical lens is made of low-dispersion, high refractive index glass, which enhances optical performance. The built-in ND (Neutral Density) filter caters well to high-sensitivity cameras, giving no change in hue of color rendition. The focal length is 2.2–6.0 mm and the lens fast aperture (F-number) is 1.3.