The filmmakers did draw inspiration from another ghostly classic of the same era: The Innocents (1961), which was shot by Freddie Francis, BSC.
"It was beautifully photographed in black-and-white anamorphic, and has amazing depth of field. They lit everything very hard, shooting at T11, so they didn’t often have to use diopters. We couldn’t do that today, because of the way we use soft light. I later spoke to Freddie Francis’s operator on that film, Ronnie Taylor [BSC], who was our B-camera operator when we shot our exteriors in England. He explained how Freddie had used graduated filters on both sides of the frame to keep the walls dark, and how the actors even wore sunglasses between takes"
- Karl Walter Lindenlaub, ASC, BVK