7Artisans 50mm F1.05 (Canon RF)

Testers agree the centre is usable at f/1.05 and that contrast at portrait distances is high for such a fast lens, with sharpness improving clearly by f/2. Bokeh is the strong point: transitions are smooth, highlights stay round across much of the frame and there is no onion-ring texture. Light falloff wide open is low for an ultra-fast fifty, and barrel distortion is slight.

The reports differ on aberrations. One lab test found colour fringing very well controlled, while a field test on another copy found strong purple fringing and longitudinal colour that persists to f/2.8, plus heavy coma wide open. Corners at infinity are weak even stopped down in that test, flare with the sun in or near the frame is poor and no hood is supplied. The clickless ring is easy to knock and hard to set precisely for stills.