Olympus M.Zuiko Digital ED 12mm f/2.0 review by Ming Thein: Those are my only two complaints: the inaccuracy of the pseudo-manual focus clutch, and the continued minor farce of the lens hood.

"Although the lens in general well corrected, you do get the feeling that it’s on the extreme edges of what was possible with the design constraints put upon the optical designers: there’s visible CA against high contrast subjects, especially in the corners where you can get up to 2 pixels’ worth; there’s also very noticeable distortion. Fortunately, it’s fairly simple in nature – barrel with no sombrero/ moustache – and is easily correctable in ACR. Flare exists but the ZERO coating does a good job of keeping it to a minimum – even without the hood.

Stopping down to f4 on the OM-D makes everything but the distortion go away, leaving you with an excellent optic. It doesn’t quite have the transparency of the 75/1.8 or 60/2.8 Macro, but it’s fairly close if used stopped down. It is definitely the best wide option for M4/3 users at the moment. One interesting use of the lens is for handheld long exposure photography – due to the short focal length and excellent stabilizer in the OM-D, shutter speeds of anywhere down to 1/2s (consistently) or 1s (occasionally) with critically sharp results are possible, making for some interesting photographic opportunities."

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