The Zuiko 21mm lens (92° angle of view) is one of the smallest and lightest super wide-angle lens you can find on the market today. Optically, it consists of 7 elements in 7 groups. This lens focuses down to 0.2m and provides a wonderful macro/wide-angle perspective.
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)
Minimum and Maximum aperture: f/16 ~ f/3.5
Filter attachment size/filters: 49mm screw-in
Length: 31mm (1.2")
Maximum Diameter: 59mm (2.3")
Weight: 185g (6.5 oz)