Canon EF-M 22mm f2.0 STM lens review: compact prime with high image qualityBy Kevin Carter - Wednesday September 11 2013 Lens Review
With a DxOMark score of 21 points the 22mm is a decent performer for a high-speed compact lens with a short focal length. Although it has quite high vignetting at maximum aperture it’s well controlled from f/2.8 onwards and it has reasonably low levels of chromatic aberration. Transmission at 2.3Tstops could be better but it’s not unexpected in a lens of this type. Sharpness is high, though, at 13P-Mpix and it has good edge-to-edge sharpness overall though that applies mainly to aperture settings from f/2.8 onwards.