how flash works

When you’re us­ing flash alone, it’s the du­ra­tion of the flash that con­trols the length of the ex­po­sure

NPhoto - - Nikopedia -

The flash it­self is a very short pulse of light. Ef­fec­tively, the length of the ex­po­sure is the du­ra­tion of this flash, not the length of time the shut­ter is open. You can’t con­trol the flash ex­po­sure by ad­just­ing the shut­ter speed.

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