Be sure to read the reviews about each and every Leica lens. Some of the lesser Leica cameras are made in Japan by the same OEM which makes cameras costing much less. Sigma and Tamron lenses have proved unsatisfactory. We had two lenses of this category donated and the images fuzzed out even at 8x10 size of enlargement. Never buy a cheap lens.
Cheap lenses are a total waste of money.
F.L.A.A.R. get lots of equipment of this nature at Stan Tamarkin camera company. I have been a customer there for over a decade. Menu for information on other aspects of cameras and photography. Menu for information on panorama camera systems.