The Mamiya 645M 300mm f/4.5 APO telephoto lens is a high-quality lens designed for medium format cameras. With a maximum aperture of 4.5, manual focus, and a sturdy metal exterior, this lens is perfect for capturing detailed images with a shallow depth of field. The telephoto focal length of 300mm allows for capturing distant subjects with precision and clarity, making it ideal for photographers looking to expand their creative capabilities in the realm of medium format photography. Ideal for Mamiya cameras from the 1990s, this lens is a reliable and versatile choice for professionals and enthusiasts alike.