Out of pure curiosity, I wanted to find out what this lens is. The camera appears to be a Leica M2, and since Winogrand is using the viewfinder I assume it is a 35mm (he would switch between a 28-35 sometimes). My guess is based on the very "super-angulon" like design it might be the 35mm summicron pre-asph. There isn't enough resolution to identify any markings. Can anyone confirm my suspicions?
It could be the 35mm Summilux. The chrome at the rear is hard to make out, but to me it looks like the larger knurled chrome mounting ring of the Summilux rather than the thin chrome lens flange of the Summicron.