This item is a Vivitar 70-150mm f/3.8 Close Focusing Auto Zoom camera lens.  It has a Minolta MD bayonet mount.  This lens was produced in two versions, a push pull and a two ring version.  This is the two ring version.  Some users like the push pull version, but for close work you would have to deal with zoom creep.  The two ring (one for the zoom and one for focusing) design eliminates this problem.  Either version is regarded as optically very sharp, especially for the price.  This lens shows a good bit of wear, mainly on the aperture ring.  The filter ring is distorted very slightly.  So it can be hard to mount a filter.   It comes with a UV filter.  So you don't haveto worry about that.   The focus and aperture are in proper working order.  The glass is also in great shape, clean and clear, with no scratches.    It has a nice built-in lens hood.