Mount: Adaptall II (Interchangeable mount system)

10 elements in 9 groups
Angle of View:  84°
Diaphragm Blade Number: 5
Minimum Aperture:  F/22
Minimum Focus:  9.8in. (0.25m)
Macro Mag. Ratio 1:7
Filter Diameter: ø55
Weight: 8oz. (227gm)
Diameter x Length: ø2.7 x 1.9in. (ø68 x 43mm)