this post was submitted on 03 Mar 2025
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You need the sensor to be exposed to a bombardment of photons to be stimulated and to gather the image data.
It needs to be kept open for some time frame.
It's a bit reductive, but if you only kept the shutter open for let's say, the Planck time you would be lucky to catch one photon on the sensor. So the time has to be greater than that, but obviously less than infinity.