Mount: Adaptall II (Interchangeable mount system)

12 elements in 10 groups
Angle of View:  104°
Diaphragm Blade Number: 5
Minimum Aperture:  F/22
Minimum Focus:  9.8in. (0.25m)
Macro Mag. Ratio 1:9.6
Filter Diameter: ø82
Weight: 9.4oz. (267gm)
Diameter x Length: ø2.8 x 2.0in. (ø71 x 47.5mm)