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How we Measure the Shutter

The shutter is a curtain that opens and then closes after a bit. The longer it's open, the more light that goes through, but we need to know precisely how long it's open, so we have a unit for it: shutter speed.Though it's called shutter speed, it's really a duration, and so it's measured in seconds. You'll typically see fractions like 1/60 or 1/30, but you can set longer durations, even 30 seconds or more if you want your photo brighter.