Neewer Cell Phone Filter Kit  type_Remote Release and I'm not talking about

and I'm not talking about that fancy premium plastic

Sold as-is

with a separate (and pretty well made) underwater housing indicated for use down to 30m (100ft)

The Leitz Summicron 50mm f2 is a classic standard lens for Leica M mount cameras

These will fit any lens with a 52mm thread

Neewer Cell Phone Filter Kit &nbsptype_Remote Release and I'm not talking aboutA surprisingly decent filter kit that should fit most smartphones, consisting of a clamp on holder threaded for 67mm filters, plus a set of seven filters: a circular polarizer, four colour grad NDs, an ND filter, and a star filter and because the threading is a standard 67mm size, you can use it with any other appropriately sized filter. In excellent condition.