Tate Britain's exhibition for summer 2012 documents the work of photographers who, between 1930 and 1980, came to London to make work about the city and its communities. Around 150 classic twentieth-century photographs of London are on display by all the greats – including Henri Cartier-Bresson, Bill Brandt, Elliott Erwitt, Robert Frank, Dora Maar, Irving Penn and Marc Riboud. The show explores the different relationships the photographers had with the city, as refugees, citizens or tourists, and how their experiences shaped their work. It includes photographs from the collection of Eric and Louise Franck. Two thirds of the Franck's collection has been promised as a gift to Tate. It will more than double Tate's holdings of photography.