This is a 12mm threaded 2.1mm lens that will fit many common cameras. With the RMRC 1/3" CCD, this lens will give you an approximately 150 degree field of view.
NOTE: This lens does not have an IR filter. If you are using a CMOS camera in daylight, you should purchase a lens that includes and IR cut filter or your video colors will not be correct in daylight! The lack of filter does improve night vision, however.