Sigma Rule (in photography)

In photography, a Sigma Rule generally refers to guidelines for optimal image quality related to the "sigma" of a set of data points, such as noise levels or exposure. For example, in assessing image sharpness or noise, the "sigma" (standard deviation) helps measure variability, guiding photographers on the best settings. While not a formal rule, it implies that understanding and managing statistical measures like sigma can help produce better, clearer images by controlling factors like focus, exposure, and noise reduction. It's a concept borrowed from statistics to inform technical decisions for improved photographic results.