Focal length: 21mm

Aperture ratio: 1:3.5

Optical construction: 7 groups, 7 elements

Angles of view: Diagonal: 92°

Distance scale: (m) 0.20 to infinity (OO)

Focusing: Straight Helicoid

Diaphragm operation: Automatic

Minimum and Maximum aperture: f/16 ~ f/3.5

Minimum photographic range: 14cm x 21cm (5.5" x 8.3")

Filter attachment size/filters: 49mm screw-in

Lens hood: 49mm screw-in

Length: 31mm (1.2")

Maximum Diameter: 59mm (2.3")

Weight: 185g (6.5 oz) (newer version indicates 180g (6.3 oz).