Video camera lenses are optical devices that attach to video cameras used in machine vision, quality assurance, and remote monitoring applications. They are permanently fixed to video cameras, or used interchangeably with lenses of different focal lengths. There are several basic types of products: aspheric, pinhole, close-up, and wide angle. Aspheric lenses produce large angles of refraction and short focal lengths. Pinhole lenses are small-diameter devices that are designed for insertion into tubes, holes, or other small areas. Pinhole lenses with right-angle bends are called 90° pinholes. Close-up lenses provide short focusing distances for digital photography or imaging. Wide angle lenses offer a wide field of view for broad image captures.