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Long exposures are taken with shutter speeds generally longer or much longer than one second, in order to capture stationary objects in low light while blurring or obscuring moving elements.
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Why are these light trails large blobs of light instead of nice thin lines?
The blobs result from the bright areas being extremely overexposed. So, quite simply, you need less light coming in. The ways to do that are:
shorter shutter speed (keeping ISO & aperture the same.. …