Flash factor is a numerical value that helps photographers determine the correct exposure when using a photographic flash. It provides a quick guide for adjusting camera settings such as aperture and shutter speed to achieve well-exposed images under flash illumination.
Flash factor is closely related to the guide number, another key measurement used in flash photography. By understanding flash factor, photographers can calculate the optimal distance and settings for their flash, ensuring consistent results whether shooting in a studio, indoors, or in low-light outdoor conditions. Proper use of flash factor contributes to balanced lighting and sharp, professional-quality photographs.