Imaging recource: Lawful lighting: Understanding light falloff using the inverse square law of light

    As your light source moves further and further away from your subject, it is obvious that the light becomes dimmer. However, the light does not decrease in a linear way, but rather falls off to the square of the distance. This is the inverse square law of light. This is an important concept for photographers who are regularly in control of their lighting. Sareesh Sudhakaran of wolfcrow has written an article and published a video aimed at explaining what the inverse square law of light is and how you can use it to your...
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