The black anodised Leica Tri-Elmar-M 16-18-21mm combines three super wide-angle focal lengths in one compact lens with minimal distortion, making it ideal for demanding subjects including architecture. Diagonal angle of view: 16/18/21 mm ? 107°/100°/92°, Focusing range: 0.5 m to 8, Largest reproduction ratio: 16/18/21 mm ? at 0.7 m 1:38/35/30, Number of lenses/groups: 10/7, Length*1: 66 mm, Weight*1: 335 g, Lens hood: Screw-on, Filter/filter thread: E67