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Yeah 5s is still long on the scale of seeing, at least on the solar system scale, but I’ve observed (read: PixInsight measured) differences in subs that are “short” (5-10s) compared with “long” (1m+)
Having selectively stacked them, it’s practically impossible to notice any difference.
More challenging with lots of shorter subs is ensuring the shots are sky limited and not read noise dominated. Oh and dithering is a nuisance with shorter subs too, as it wastes more photon collecting time.
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