> WITHOUT DISTORTION FROM ROLLING SHUTTER Where do you read this? I see no mention of a global shutter. Rolling shutter is a misleading name. It is an attribu

> WITHOUT DISTORTION FROM ROLLING SHUTTER Where do you read this? I see no mention of a global shutter. Rolling shutter is a misleading name. It is an attribute of the sensor, not of any mechanical shutter in front of it. It maybe should have been called rolling read-out. The CMOS image sensor is read out, and reset, line by line --- instead of an image being taken by the whole sensor at once (as in a global-shutter sensor). Therefore the image taken by line 2 is a moment later than the image taken by line 1, and so forth. Global shutter sensors are rare. They don't really cost a lot more, but historically they lose two or more f-stops of exposure latitude and light sensitivity. This is because each photodiode in the sensor is crammed with a bit more circuitry, to store the charge until it is read out, so that a consistent image can be frozen all at once.