A 30mm lens is a type of camera lens that has a focal length of 30 millimeters. This lens is often used in photography for its versatility, providing a field of view that is wider than a standard 50mm lens but not as wide as a 24mm lens. It is suitable for various types of photography, including portraits, landscapes, and street photography. Typically, a 30mm lens can be found in both prime and zoom variations. Prime lenses have a fixed focal length, while zoom lenses can cover a range of focal lengths. The 30mm prime lens is popular among photographers for its sharpness and ability to perform well in low-light conditions.