Nikon AF 16mm f2.8D Fisheye

Specifications
Focal length     16mm
Picture angle     180° with film (F-series) SLRs
107° with digital (D-series) SLRs
Maximum aperture     f/2.8
Minimum aperture marked on scale     f/22

Lens construction     

8 elements in 5 groups;
Minimum focus distance     0.25m (9.84 inches)
Maximum reproduction ratio     1:10
Filter attachment size     Provided
Overall dimensions (approx.)     63mm diameter x 57mm long
(2.48" x 2.24")
Extension from the lens mount (approx.)     57mm (2.24")
Weight (approx.)     290g (0.63lb)
Hood     Built-in
Case     CL-S1, CL-31S (optional)
Usable teleconverters     TC-201 or TC-14A