In photography, fog refers to unwanted exposure of unprocessed film to light, which creates a veil of density on the image. This can occur accidentally if the film is exposed outside the camera or if the camera has a light leak around the sealed film chamber.
Fogging often appears as orange or brown streaks or patches spreading across the film, reducing image contrast and detail. Preventing fog requires careful handling of film, ensuring light-tight camera bodies, and proper storage of unprocessed negatives. Understanding fog is important for photographers working with traditional film to maintain the quality and clarity of their images.