Canon EF-M 22mm f/2 STM Lens review by Ken Rockwell: The Canon 22mm is super sharp at all settings, however coma softens the far corners a little at f/2.

The Canon 22mm f/2 STM is inside out from a modern pro lens: it's metal on the outside for show, and plastic on the inside for low cost. It's super-compact and performs excellently, so I'd strongly suggest it for the EOS-M, since the whole point of the EOS-M is tiny size. This lens is tiny. Manual focus is awful; don't bother trying to use the manual focus ring. The ring is merely an input to a computer, which in turn controls the lens motor — if you have everything else set properly.

It only works if the camera is both on and awake. There is little direct relationship between the motion of the ring and the motion of the lens, and there is some time delay. Ergonomics are drab: There are no controls on this lens.

There is a manual focus ring, and it responds poorly. It's easy to mount and unmount from a camera, however the index dot is merely painted, so it won't be felt in the dark.

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