The Canon FL 135mm f2.5 BL Lens is a telephoto lens designed for Canon FL mount cameras. With a maximum aperture of f/2.5, this lens allows for capturing clear and detailed images with a shallow depth of field. The manual focus feature gives photographers full control over their images, making it ideal for both beginner and advanced photographers alike. The 135mm focal length provides a versatile telephoto range, perfect for a variety of photography styles and situations.