The Leica 50mm f/2 APO-Summicron-M ASPH is the finest lens in the entire line of Leica M lenses. With esentially perfect performance by ƒ/2.8, almost no field curvature and exceptional color correction, it sets the standard for the M lens line.
Thus it seems fitting to test it on the most demanding test subject of all: a planar subject with extraordinary fine detail, a true stress test that reveals the slightest weakness no matter how fine the lens.
A dyadic approach in Guide to Leica:
This ƒ/2 - ƒ/16 aperture series includes HD and UltraHD images as well as large crops across the aperture series.
This particular 50/2 APO is a replacement directly from Leica Germany received late in 2013. It incorporates improvements that adddress (in part) the flare issues that troubled the “rev A” lens.