Breaking the Law of Reciprocity

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The rules of photography say that if you lengthen shutter speed, you have to close down the aperture to compensate, right? It's known as the law of reciprocity and has been one of the fundamentals taught to new photographers since photography first started. But there are ways to break the rules and still end up with the same exposure. And knowing them can help make you a better photographer....

More... (http://www.earthboundlight.com/phototips/singh-ray-vari-nd.html)