Leica Summicron 50mm f2 Collapsible for LTM viewing filter or glass plates

or glass plates

you can not practically mount it to the top of the monopod

Takes two AA batteries (not included)

You probably don't want to tuck this into your camera bag just in case- it weighs 4

Leica Summicron 50mm f2 Collapsible for LTM viewing filter or glass platesThe 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.