http://www.photozone.de/canon-eos/960-canon_m22_2

MTF (resolution)

Pancake lenses are usually pretty good regarding their resolution characteristic although they rarely achieve top results. While we have yet to test further EF-M lenses, the Canon EF-M 22mm f/2 STM follows this general guidance. The center quality is excellent at f/2 and the borders are also impressive but the corners are soft here. Stopping down to f/2.8 lifts the corner results but the real boost sets in at f/4 where images are very sharp across the frame (notwithstanding Depth-of-Field, of course). This high level is kept at f/5.6. Image softening due to diffraction is getting more obvious from f/11 but that's a physical limitation.

The centering quality of the tested sample was Okay. Field curvature is moderate but visible.

Below is a simplified summary of the formal findings. The chart shows line widths per picture height (LW/PH) which can be taken as a measure for sharpness. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations

우리나라 유저들의 평판과는 좀 다르네요.입 아프게 아주 좋다고 칭찬하는 글을 많이 봤는데 개방 주변부는 영 그렇네요.

나쁘다는 말이 아니라 주변부가 생각보다는 못하다는 말입니다.

두 스탑은 조여줘야 주변부가 쓸만하네요.