Stacking many short exposures reduces random noise by the square root of the number of frames. Enter your sub-exposure length, number of frames, gap between frames and file size to see the gain and what the session costs in time and storage.
Applies to Milky Way stacks, deep-sky imaging and noise-free nightscapes.
How it works
SNR gain = √n; noise reduction in stops = ½·log₂ n.
FAQ
How many frames for a Milky Way stack?
10–20 frames already cleans up noise substantially; returns diminish because of the square root.
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