FILM 1431: BLOW OUT
TRIVIA: Quentin Tarantino stated in an interview that this film is his favorite Brian De Palma movie. In fact, Tarantino cast John Travolta in Pulp Fiction (1994) because he liked his performance in this movie so much.
The use of a split-focus diopter lens is evident in several scenes, in particular the sound recording scene and the hospital scene. The split-focus lens is attached to the main lens, and it affects only the left or right portion of the main lens' view. This changes the focal distance of part of the image, allowing objects at two distances (in the foreground and background) to be in sharp focus.
The idea of a man discovering a crime by listening to a recording is a reinterpretation of Michelangelo Antonioni's film Blow-Up (1966), but using sound instead of photographs.
Brian De Palma got the idea for the story while doing the sound mix on his previous movie, Dressed to Kill (1980).