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Facts about flash units and taking photos using a flash - By: Carol Pruitt, 2009-01-06 For most of us firing the flash is something that happens in the background and that does not require our attention.. Flash photography was not always so easy to use. Flash is useful in many situations for example when taking photos in dark scenes or when getting rid of shades in fill in mode. It is beneficial to know some facts about flash usage and how it works. COMMENTS Add a comment |