This Spiratone Telephoto lens is a must-have for any photography enthusiast. With a maximum aperture of f/6.3, it provides an excellent shooting experience for Pentax cameras. The lens has a manual focus type and a mount of M42, making it an ideal choice for those who prefer full control over their shots. The lens has a focal length of 400mm, making it perfect for capturing distant subjects. Its compatibility with Pentax cameras ensures that you can use it with ease and get the desired results. The package comes with a case, making it easy to store and transport. Invest in this Spiratone Telephoto lens and take your photography skills to the next level.