Nikon 20mm f/2.8 UW-Nikkor

Brand: Nikon
Description: Mount: Nikon F, lens type: wide-angle, focal length: fixed, prime lens focal length: 20 mm, aperture F at min. focal length: 2.80
Additional Information: Designed for underwater photography only.
Type: Lens
Length: 74 mm
Diameter: 70 mm
Focal length: Permanent
Lens type: Wide angle
Max viewing angle: 78 degrees min
Minimum focus distance: 0.03 m
Focal length of prime lens: 20 mm
Bayonet: Nikon F
Filter thread diameter: 67 mm
Aperture F at min. focal length: 2.8
Minimum aperture F: 22
Number of element groups: 7
Number of elements: 9