Sigma AF 8mm f/3.5 EX DG Circular Fisheye Pentax KA/KAF/KAF2

Brand: Sigma
Description: Mount: Pentax KA/KAF/KAF2/KAF3, lens type: ultra wide-angle fisheye, focal length: fixed, autofocus, prime lens focal length: 8 mm, Aperture F at min. focal length: 3.50
Type: Lens
Functions: Focusing motor for Nikon F
Length: 68.6mm
Diameter: 73.5 mm
Focal length: Permanent
Lens type: Ultra wide angle fisheye
Max viewing angle: 180 deg.min
Minimum focus distance: 0.135 m
Auto focus: There is
Focal length of prime lens: 8 mm
Bayonet: Pentax KA/KAF/KAF2/KAF3
Aperture F at min. focal length: 3.5
Minimum aperture F: 22
Number of aperture blades: 6
Number of element groups: 6
Number of low dispersion elements: 1
Number of elements: 11