Portraits fill flash can add to your photos by ironing out the unwanted shadows and dark circles under the eyes of your subject. It can evenly scintillate your subject and shiny days. The output of your shot will not pan out unless you balance your flash with the existing natural light. With the compatible balance of both flash and natural light, you can produce a breathtaking and realistic macro photo. The camera feeds an automatic amount of flash when a scene is snapped but depending on the camera, you can even manually operate the flash output.