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===== ISO ===== ----ISO equates to the sensitivity of film which was used prior to digital cameras. In modern DSLRs the same number of photons is collected regardless of the ISO, but these are converted into pixels at higher or lower rates dependent on it. ISO settings, while amplifying signal, also amplify noise, resulting at higher noise at higher ISOs. There is a point at which the tradeoff between noise and signal amplification is no longer advantageous, this is often referred to as "unity gain". Some people enjoy nitpicking over how unity gain isn't a real thing in DSLRs, but it still remains a valuable analogy. The ideal ISO for many cameras is usually around 800 but varies, especially with newer models.
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