Vivitar 500mm Mirror Lens f/6.3

Weight: 651 g
Brand: Vivitar
Description: Mount: Pentax KA/KAF/KAF2/KAF3, lens type: telephoto, focal length: fixed, prime lens focal length: 500 mm, aperture F at min. focal length: 6.30, aperture F at max. focal length: 6.30
Type: Lens
Length: 119.5 mm
Diameter: 98 mm
Focal length: Permanent
Lens type: Telephoto lens
Minimum focus distance: 2 m
Focal length of prime lens: 500 mm
Bayonet: Pentax KA/KAF/KAF2/KAF3
Filter thread diameter: 95 mm
Aperture F at max. focal length: 6.3
Aperture F at min. focal length: 6.3
Number of element groups: 6
Number of elements: 7