http://www.vam.ac.uk/content/articles/b/working-methods-bill-brandt/
Some hints about Brandt in this link. Doesn't specifically mention any camera model or lens. I suspect he would have used a Relleiflex, so possibly 55-60mm (not sure how that equates to 35mm)? There were various 35mm cameras around when he was working, particularly Zeiss and Leica, and large format plate cameras were still popular.
I know all of Cartier Bresson's work was done with a 50mm, as a comparison.
Some hints about Brandt in this link. Doesn't specifically mention any camera model or lens. I suspect he would have used a Relleiflex, so possibly 55-60mm (not sure how that equates to 35mm)? There were various 35mm cameras around when he was working, particularly Zeiss and Leica, and large format plate cameras were still popular.
I know all of Cartier Bresson's work was done with a 50mm, as a comparison.