A board lens is a type of lens that is designed to be mounted directly onto a camera board or similar flat surface. Board lenses are commonly used in security cameras, machine vision systems, and other industrial applications where a compact and low-profile lens is required. Board lenses are often small and lightweight, with a fixed focal length and a wide angle of view. They typically have a simple design and are relatively inexpensive compared to other types of lenses. However, their fixed focal length and lack of zoom capabilities can be limiting in certain applications. Board lenses are available in a variety of focal lengths and aperture sizes, allowing them to be used in a wide range of imaging applications. They can be made from different types of materials, such as glass or plastic, depending on the specific requirements of the application.