dotur
od karnevala
Do you mean the new Leica APO-Summicron SL 50mm f2? I have no idea. As for the old collapsible 50mm Summicron in L39 or M mount, I've sold them both long ago. The rigid ones are a tad bit better.
raid
Dad Photographer
Many people swear by the L Mount Summicron.
dotur
od karnevala
I know they do. However, I prefer Elmar 50 2.8 for people, and for other subjects my rigid Summicron 50 from the Sixties was better and sharper than the 2 collapsible ones I've sold. But those were all secondhand, used lenses...