The Reciprocal Rule in Photography, Explained
Briefly

If you've ever come back after an exciting photoshoot, only to find that some (or all) of your images are frustratingly soft, then you might be dealing with a common problem: blur due to camera shake.
What is the reciprocal rule? How does it work? And how is it affected by crop factors and image stabilization? In this article, I explain everything you need to know about the reciprocal rule in photography.
Read at Digital Photography School
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