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Introduced in April 2007, the Color-Skopar 21mm f/4 P is Cosina's compact M-bayonet wide angle, eight elements in six groups covering 91 degrees. It is a small all-metal lens of about 144g with a 39mm filter thread, so it sits on an M body without blocking the finder the way faster 21mm lenses do. Focusing runs to 0.5m on the scale and couples to the rangefinder from 0.7m. No M body carries 21mm framelines, so an accessory finder does the framing.