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Anonymous
As said, hot pixels and/or noise.
If you're worried about not being able to make photographs like this, create a 2114x1424 image in Photoshop or GIMP and use the "Bucket" tool to fill the area with pure black. It's much faster and easier than using your camera, and gives the same result.
Otherwise, don't worry about it if you can't reproduce it under normal circumstances.
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