Cosina (Vivitar) 35-70mm f/3.5-4.8 MC Macro Lens for Pentax Cameras
 
Focal length: 35-70mm    
Weight: 220g
Aperture: f/3.5 to f/22 6 bladed aperure    
Mount: Pentax K (PK) But can also be found with other mounts.
Closest Focus: 0.4m (1.3ft)
Covers: Standard 35mm film size (24×36 mm negative)
Filter Size: 52mm