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Fast and Slow While Sitting Still Understanding the relationship between lens opening, shutter speed, and film or sensor sensitivity is one of the dividing lines between being a casual shooter and being a professional filmmaker. When you know how those values interact and the way they affect your image, you begin to control the technical quality of your images. The unique language that has grown up to describe those ideas is probably the barrier to easy understanding. Perhaps the most confusing word is “fast.” We speak of fast lenses, fast shutter speed, and fast film/sensors. In each case, the word...

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