7Artisans AF 50mm F1.8 (L-Mount)

Testers found centre sharpness very good at f/1.8 and excellent from f/2.8 to f/8. At portrait distances the lens is sharp across the frame wide open, but the corners at infinity need f/5.6 to f/8 to catch up. Distortion is practically zero, bokeh is smooth with a gradual transition, and autofocus is quick, quiet and accurate enough for everyday stills, though not completely silent.

The weak points are very strong optical vignetting (light falloff of about 2.5 EV at f/1.8), clearly visible but correctable lateral CA, bokeh fringing wide open, onion rings in highlight discs, slight focus shift between f/2.8 and f/4 and only average flare resistance. The stepless aperture ring is easy to knock out of A because it has no lock, and the size and weight surprise people expecting a compact budget fifty.