The Mamiya Sekor 400mm f/6.3 M42 Telephoto MF Lens is a high-quality lens designed for use with mirrorless cameras. Made in Japan, this lens features a manual focus mechanism and a smooth telephoto focal length of 400mm, making it ideal for capturing distant subjects with precision and clarity. The lens is lightweight at 3 lbs and has a compact construction, making it easy to carry and use on-the-go. Its M42 mount ensures compatibility with a wide range of cameras, making it a versatile choice for photographers looking to expand their kit.