A darkroom safe light should be at least how many feet away from the film being opened?

A darkroom safe light should be at least how many feet away from the film being opened?

• A. Five feet
• B. Four feet
• C. Three feet
• D. Six feet

Answer: (B)

Safelight fogging occurs when the film emulsion is exposed to the safelight during handling. The amount of light reaching the film drops with distance, so moving the safelight farther away reduces the risk. Four feet is the recommended distance because, with a proper safelight filter and typical wattage, the light intensity at that distance is low enough to prevent fogging during the time you open and handle films. If the safelight is closer, even brief exposure can cause fogging and degrade image quality. So placing the safelight at least four feet away provides a practical balance between safe handling and minimizing fogging.

Safelight fogging occurs when the film emulsion is exposed to the safelight during handling. The amount of light reaching the film drops with distance, so moving the safelight farther away reduces the risk. Four feet is the recommended distance because, with a proper safelight filter and typical wattage, the light intensity at that distance is low enough to prevent fogging during the time you open and handle films. If the safelight is closer, even brief exposure can cause fogging and degrade image quality. So placing the safelight at least four feet away provides a practical balance between safe handling and minimizing fogging.