Whenever you capture a photo of your subject outside, the lighting isn’t always keeping the subject well lit. With the fill flash technique, you can have both natural light and fill light to have a perfectly lit subject. Fill flash is a photography technique in which the camera flash is deployed to illuminate the darker areas of an image, especially the subject. When the subject is underexposed due to the deficit of sunlight and other lights or sometimes due to the backlight, fill flash is supplemented to correctly expose the subject. Fill flash can be used for portraits of people or even objects. Having the ability to fill in shadows outside makes a well lit photo, and reveals what you are trying to capture.