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I'd like to take a moment to write about grain. Grain is a fundamental part of all photography. It's been there since the beginning and it's even made the jump to the digital age. Well, kind of.
In film, grain is physically visible due to the use of silver-halide particles. These particles are what make film sensitive to light. Low speed film uses less of these particles and has very fine, barely observable grain when moderately enlarged. However, when using high speed film you increase the size and amount of visible grain. It's a trade-off. More film speed = More grain. Less film speed = Less grain. While low speed film is harder to shoot, as it requires more light to properly expose, I often prefer the cleaner pictures it produces...