Mount: Adaptall II (Interchangeable mount system)

13 elements in 9 groups
Angle of View:  34°-11°
Type of Zooming:  Push-pull
Diaphragm Blade Number: 8
Minimum Aperture:  F/32
Minimum Focus:  43.3in. (1.1m)
Macro Mag. Ratio 1:4
Filter Diameter: ø52
Weight: 10.3oz. (293gm)
Diameter x Length: ø2.6 x 3.1in. (ø67 x 79mm)