The Inverse Square Law and How It Affects Your Lighting

The inverse square law is one of the most fundamental and important rules when it comes to lighting in photography, and understanding it can make you a better photographer. This excellent video will introduce you to the law and show you how its affects your work. 

Coming to you from ZY Productions, this great video will teach you about the inverse square law and its practical consequences on your photography. The problem is that humans are inherently bad at having an intuitive grasp for nonlinear functions, and that can unconsciously lead us astray when we expect our lights to behave in a linear fashion with respect to their intensity over distance. However, this is not how light actually behaves: light intensity actually decreases as the square of distance. In other words, instead of light being half as bright when you double your distance from it, it actually a quarter as bright. And while this may all seem an overly academic way of thinking about lighting, it has very practical consequences on your work and the way light interacts with and renders your subjects, and it is well worth getting to know the law and its behavior. Check out the video above for the full rundown. 

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