Fill-in Flash
Fill-in flash is a term often used to describe a technique where your flash is used to literally “fill in” some of the shadows cast by the main light. In most cases, this main light is the ambient light, usually outside.
Fill-in flash can also be used as a fill light along with other flashes, reducing the contrast to a range that’s easily recorded by the camera’s sensor. It can also be used indoors, for example if you are trying to reduce the hard shadows caused by overhead household spotlights. (In this case, you’d want to gel your flash CTO to match the output of the main light, the household tungsten bulbs.)
With fill-in flash, you are usually just filling in the shadows and therefore don’t really want the output of the flash ...
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