Sharsted tells Gingold he doesn't have much interest in photography. In real life, actor Rene Auberjonois is a highly accomplished photographer who has had his work exhibited in galleries worldwide.
Per the title, the camera obscura or dark chamber is an optical device used, for example, in drawing or for entertainment. It is one of the inventions leading to photography.
"Cool Air" is based upon the story by H.P Lovecraft of the same title.
"Cool Air" takes place in 1923 and 1971.