How does long-exposure photography work?
In: Technology
Imagine you have a grid of buckets, covered by a retractable roof. If you retract the roof while it’s raining, the buckets will fill up with water.
Suppose it’s only raining over a very small region. Only the buckets under the rain will fill up, while the other buckets won’t.
Now, consider, what if that small region of rain is moving. If you open and close the roof very quickly, the rain won’t have much time to move and only a few buckets will be filled.
But if you open it, and leave it open, you’ll see all the buckets it passes over will get filled. You’ll end up with a trail of full buckets, even though the source was smaller than that area.
This is more or less how cameras work, but with light instead of water, and sensors (or film) instead of buckets.
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