I'm fond of my Summar f-2 col. It is not a lens for every occasion but within the area that an uncoated lens may work in it is a very sharp lens. Stopped down it produces the tack sharp images associated with Leica and when opened up it blurs the background in a pleasing (to my eye) manner. I also have one of the f 1.7 Minolta 50mm's (md) and agree that it is very good.