Did You Know: Lighting Ratios
A common way to describe both quantity and quality of light is the lighting ratio. It indicates the amount of light (in stops) that illuminates the highlights compared with the shadows. The first number in the ratio refers to the key or mainlight; the second to the shadows or fill light. The closer the two numbers are to each other (e.g., 1:1), the flatter the overall lighting. The more they vary (e.g., 4:1), the higher the overall contrast.
Lighting ratios can help you retain detail. If your camera’s sensor can capture a 6-stop range of highlight-to-shadow detail, and your scene has a lighting ratio of 7:1, you must drop light levels in the highlights or add light to the shadows until you reach a 6:1 ratio. Ratios can be determined with in-camera spotmeters, but handheld flash meters can be easier.
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