What is the lens of Leica in robert frank?

It seems that 1958 gave up photography, and his photography career is only recognized as ten years, that is, 1948- 1958. It is said that after his Leica camera was stolen at 1958, he simply left photography. Judging from this, he should only have one Leica. 1948, Leica spiral camera is still in the world. M3, who dominated the world, didn't appear until 1954. 1955- 1957 was the time when he filmed Americans. For photographers of that era, familiar lenses were rarely changed. I remember that M3 seemed to be more than 230 dollars. According to the historical data of 193 1 year-old packard, the price is 1000 USD. A Leica M3 without a lens is probably a 1/4 car. It is estimated that robert frank doesn't have much money to buy a M3. It is likely that he used an old Leica with screws.

Then the lens can naturally be inferred. Judging from the photos of many Americans, it is obvious that the ambient light is not strong, and it should be a lens with a large aperture. Therefore, the lens he used to shoot Americans is probably the first generation M50/2 screw version (1954) or the screw version of Leica's first high-speed lens Xenon 50/ 1.5 (. Moreover, he started taking pictures in 48 years, so before he took pictures of Americans, he obviously had a 50/3.5 shrinking head (produced before World War II) or a XENON50/ 1.5. As for whether there is a lens in the later stage, it is not known. If yes, it should be the first generation M50/2 screw version or Summit 50/ 1.5. In short, the Leica lens he mainly uses should be changed within the above range.