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. A fill flash can even spice up the outdoor photos. With the integration of both natural light and flash, you can bring out the optimal output. The major problem you will encounter while using fill flash is when ambient light is behind the subject. This will result in a silhouette- a dark shape of the image that you will view. In order to derive the best upshot, you can go for a 30% flash and 70% natural light. Don’t hold back to experiment by dialing down the flash as it will let you understand and figure out the correct ratio.