How to Improve Your Long-Exposure Photography With Photo Stacking
Briefly

With the rapid evolution of digital cameras, we can now take extended exposures without significant digital noise caused by sensor overheating. Additionally, advancements in neutral density (ND) filters mean we can shoot with minimal color cast and no loss of sharpness.
Long-exposure stacking allows photographers to achieve longer exposure times without a single long shot, reduces noise and hot pixels, decreases vignetting, minimizes risks, and offers flexible post-processing options.
Read at Digital Photography School
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