Vivitar 70-205 F3.8 Macro lens for Pentax K-Mount

The Vivitar 75-205mm F/3.8 Macro Focusing zoom is a high quality telephoto zoom with fast and constant maximum aperture with one touch zoom and focus, multi-coated glass and close focusing. Its max aperture of f/3.8 remains constant at all focal lengths. Its wider aperture produces a brighter viewfinder, easier focusing and enables a faster shutter speeds in low light thus minimizing camera shake. The lens covers photographic applications from portraits at 75mm to telephoto applications at 205mm. Marked PK for The Pentax K-mount, sometimes referred to as the "PK-mount", a 3-tab bayonet lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex (SLR) cameras. It has been used by all Pentax 35 mm and digital SLRs. You can get adapter rings to fit this lens onto other camera bodies. Condition: with marks of age and use to the black body, the glass on either side looks great The back mount is 48mm diameter