This is a mount adapter for attaching Olympus OM system interchangeable lenses to the PEN F (FT, FV, F) body. I purchased this because I owned a PEN-FT, but it has been sitting unused in its original box with the OM series lenses. I have decided to sell my PEN-FT, so I am also putting this adapter up for sale. This is a rare product that is not currently available new. 〈Excerpt from the Instruction Manual〉 The type is a one-touch bayonet type, and the flange back is 46mm. A 1.4x telephoto effect of 35mm is obtained, which is especially effective when using telephoto lenses. Close-up photography can be performed with the OM system macro photo group unit. Microscopic photography can be performed with the OM system photo micro group unit. Manufacturer: Olympus Optical Co., Ltd. Included items: Cosmetic box, outer box, instruction manual