Leitz 5cm f2 Summitar for LTM air designed to look like a

designed to look like a box of film- except much larger

What does 1891 mean

a short telephoto (looks like it's meant to fit a 135mm) and a bit of extra film

But what you get in return is interchangeable lenses and better close focusing ability

Leitz 5cm f2 Summitar for LTM air designed to look like aThis is a first year (1938) Leitz 5cm f2 Summitar lens for Leica Thread Mount in good usable condition, with clean glass and smooth focusing but a fair bit of cosmetic wear, mostly on the collapsible barrel. The focus tab infinity lock (the spring loaded part) is missing, which is technically a flaw but honestly, it's a usability improvement. Good imaging. A nice vintage lens with the "old" aperture sequence (to f12. 5)