What We Like
+Exceptional compactness at 304g with f/1.8 aperture - undercuts comparable lenses by substantial margin
+Sharp performance across frame including at f/1.8, with excellent corner sharpness by f/2.8
+Standard 67mm filter thread enables use of standard filters unlike bulbous ultra-wide designs
+Smooth, quiet autofocus with fast tracking via dual XD linear motors
+Comprehensive weather sealing with fluorine coating and multiple seal points throughout design
+Versatile aperture control with switchable click/silent operation for video
Worth Knowing
−High native barrel distortion (4.7%) in RAW images requires auto-correction, and vignetting control lacks manual adjustment unlike GM models
−Significant vignetting at f/1.8 (over 5 EV) limits astrophotography performance without signal boost
−Close-focus field curvature and distortion exaggeration make flat subjects unusable at minimum focus distance
−Corner-to-corner sharpness and bokeh are compromised compared to premium alternatives