RED writes: Most are familiar with how ISO controls a camera’s sensitivity to light and susceptibility to film grain. However, ISO has other consequences with digital, and its implementation often varies. This article explores how ISO is evolving and influencing camera technique in the digital era.
With film, one had to select and load a specific magazine in advance, so the ISO speed had to remain constant. If the exposure needed tweaking afterwards, the film could be “pushed” or “pulled” during development. However, doing so was only practical within a limited range of effective sensitivities—otherwise colors, contrast, grain and other qualities would suffer.
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