The Pentagon Auto 1.8/50 M42 Screw Mount Camera Lens by Pentacon is a high-quality standard lens with a maximum aperture of f/1.8. It features manual focus and a focal length of 50mm, making it versatile for a range of photography styles. The lens is constructed with durable aluminium exterior material and is compatible with 49mm filters. Its M42 mount ensures compatibility with a variety of camera bodies. Ideal for photographers looking for a reliable and versatile lens with excellent image quality.