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Nice one, Mike! I like the colourful gradients.
Another aspect of choosing between short vs long subs for star trails is to balance the relative brightness of the stars versus background sky glow and airglow.
Shorter exposures, versus longer exposures with the same equivalent Exposure Value, will give you brighter / higher contrast star trails because the background stays constant but the stars won't smear out over long distances and become dim.
Interestingly enough, reciprocity failure back in the film days would have helped improve the star trails' contrast over the background.
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