Viviatar Vintage Vivitar 70mm-150mm f3.8 Close Focusing Auto Zoom 52MM Fixed Mount Lens

Vintage Vivitar 70mm-150mm f3.8 Close Focusing Auto Zoom 52MM Fixed Mount Lens Comes with original box, box top is missing, and original foam to sit lens into. I’m not familiar with how this item is used. I’ve no knowledge of the product. It appears to be in working order. Feel free to ask me any questions you may have.