You can easily see that fill flash is handy for both portraiture and macro photography. When it comes to portraits, fill flash can spice up them by ironing out the unwanted shadows and dark circles under the eyes of your subject. On top of that, it can evenly scintillate your subject on luminous and shiny days. When you are taking macro shots, natural lighting is adequate but fill flash can come in handy to take out the minute details of the shots. The macro photos are close-up shots and appear to be of the same size as the objects.With the integration of both natural light and flash, you can bring out the optimal output. You have predominantly two options for using Fill Flash- a built-in camera flash and an external dedicated flashgun. If you use a pop-up camera flash, you will have a flash mode called “Fill in”. Generally, 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. The mode can be selected either from an on-camera button or from the menu.