This vintage Pentax K-mount Sears Auto 50mm f/2 manual focus prime lens is for use with Pentax K-mount cameras and adapters. There are a few scuff marks and scratches on the barrel's exterior. Its focus and aperture adjustments are both smooth and its glass is free of any haze, fungus, or separation to its elements. There is no oil on its aperture blades. There are two dents in its filter ring that will prevent the use of a screw-on filter.