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A Global shutter exposes the entire imager simultaneously. The entire frame is exposed and begins gathering light; when the predetermined “shutter speed” has elapsed, the sensor stops gathering light and turns its current exposure into an electronic image.
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Used in many CCD sensors. Global shutters are immune to effects like skew, wobble, and partial exposure.
Some CMOS sensors are configured to use global shutters - in which case they do not suffer from vertical smear, skew, wobble or partial exposure.