This is a vintage RMC Tokina II 28mm f2.8 wide angle lens for Pentax K mount. It is made of aluminum and has a maximum aperture of f2.8. The lens is in excellent working condition and has been tested with a Sony mirrorless digital camera. It has a fixed focal length of 28mm and a manual focus type. This lens is compatible with Pentax film cameras and has a Pentax PK mount. It can also be adapted to some digital cameras with the proper adapter. It has a filter size of 52mm. The lens has been manufactured in Japan, and is perfect for those who enjoy vintage lenses and or adapting to digital.