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Many shutters today are composed of two parts, upper and lower.

I think you are described how the typical analog SLR camera worked before digital cameras. The shutter moved from left to right (or right to left). The first part moved left to right opening the shutter, then when fully opened waited and then second part moved left to right to close. If the shutter speed was about 1/60th of a second the entire frame was being exposed at once. For shorter times (1/125, 1/250, etc) the closing side started closing before the opening side arrived, thus an open slit moved across the film. So even a 1/1000th shot took 1/60th of a second to complete.

In digital cameras you can have a rolling shutter or global shutter. Rolling shutter works the same way as analog SLRs. The pixels are scanned from left to right, top to bottom (or some other rotated pattern like this) The exposure time is how long each pixel counts photons, but the overall scanning time can be much longer.
In a global shutter camera all pixels count their accumulated photons starting at the same time and end at the same time. These are more expensive.

Mike
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