These lenses are ideal for situations where the camera must be hidden and provide any angle of view between 4-20mm or 10-50mm. Although designed for 1/3" electronic iris cameras, these lenses can also be used on ?" cameras where they can provide up to a 120 degree horizontal field of view at 4mm. The tip of the pinhole is built-in to a removable push-on cap that also acts as a mounting support and protects the main optical system.