The Mamiya Sekor C 90mm f/3.8 MF Medium Format Lens is a vintage piece manufactured in the 1980s by Mamiya in Japan. This standard lens is designed for Mamiya RB67 mount cameras, offering manual focus capabilities and a sturdy aluminum exterior. It weighs 730g and is compatible with Mamiya cameras, making it a valuable addition to any photography enthusiast's collection, even if it is untested. The 90mm focal length and f/3.8 maximum aperture cater to capturing medium format images with a classic and nostalgic look.