Cartier-Bresson, from Hany Saad
Henri Cartier-Bresson, arguably the most powerful street photographer in history, used only a Leica 3 with a 50mm f3.5. I enjoy his photo book very much.
Bruno Ombreux adds:
Robert Doisneau is great too.
Janet Murphy writes:
Eugene Atget photographed Paris years before Cartier-Bresson was even born. Both had a keen eye, and their photographs of Paris embody a quiet beauty that remains timeless.