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What is Fill Flash?

The Basics:

Fill Flash is a technique used to brighten a subject with a flash when the main subject is underexposed, due to a strong back light.

A Little More Detail:

Suppose you’re shooting portraits outdoors on a sunny day, and the bright background is causing the subject to look dark and underexposed. Setting the exposure to the background and applying a flash to the subject allows you to properly expose the entire scene. This technique is called Fill Flash.