Michelangelo Antonioni, 1966. Swinging-London photographer captures a possible murder. The mod-era enigma.
From Wikipedia
Blowup is a 1966 psychological mystery film directed by Michelangelo Antonioni, co-written by Antonioni, Tonino Guerra and Edward Bond and produced by Carlo Ponti. It is Antonioni's first entirely English-language film and stars David Hemmings, Vanessa Redgrave and Sarah Miles. Model Veruschka von Lehndorff is featured as herself, and Jane Birkin makes her first film appearance. The film's non-diegetic music was scored by American jazz pianist Herbie Hancock, and the English rock group The Yardbirds are seen performing "Stroll On". The cinematographer was Carlo di Palma.