Also, keep in mind that light diminishes with the square of the distance. Therefore ... the closer your light is to the subject, and the further it is from the background, the less light will fall on the background. So let's say your light is one foot away from the flowers and the background is another foot away from the flowers. That makes the background receive one stop less light (i.e. half as bright). Move it two feet away and you have 2 stops less light. And so on.
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