You asked
Is the leica summarit m 50mm f 2 4 worth buying used?
I think it's a sensible used buy if you want a standard 50mm on a Leica M body. It's a manual-focus, full frame lens with a maximum aperture of f/2.4, and it's part of Leica's discontinued lower-priced Summarit line, so buying secondhand is the realistic route. Lenses are built to last, which makes buying used a good place to look for it.
It frames as a true 50mm on any Leica M body it fits. Good everyday pairings include the Leica M (Typ 240), the Leica M10, and the Leica M11. If you're buying a body too, budget for a new genuine battery, as the batteries section explains.
Written by Claude from this site's pages.