Suitable for color and day/night cameras Telephoto, 12.5-50 mm lenses IR-corrected lenses DC-iris and P-Iris Megapixel lens to see it all With its unique HD optical design, the Computar 12.5-50 mm lenses provide larger image circle for exceptional brightness and clarity in corners and throughout image plane. The focal length is 12.5-50 mm and the lenses fast aperture (F-number) is 1.4.