The Leica Summicron 50mm f2 collapsible is a small, convenient lens for Leica Thread mount cameras. It's easy to carry along when it's collapsed, and it extends easily for shooting. In excellent cosmetic condition, with only minor wear from light use. Good focus and diaphragm. Optics show some internal hazing, some front element cleaning wear: nothing too far-fetched for a lens of this type, but worth noting.