Focal length: 20mm
Maximum aperture: 1.8
Minimum Aperture: 22
Lens Construction: 13 Elements in 11 Groups
Angle of View: 94.5 degrees
Number of Diaphragm Blades: 9 Blades
Minimum Focusing Distance: 20cm/7.9 in.
Maximum Magnification: 1:4
Filter Size: 82mm
Dimensions (D x L): 88.6mm x 89.5mm (3.5 in. X 3.5 in.)
Weight 520g (18.3 oz.)