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These images are great - especially given the short integration! Apparently higher ISO actually decreases noise, rather than increasing it (contrary to common belief), but at the sacrifice of lower dynamic range. I tend to go lower ISO on my DSLR to get a better dynamic range as I can always decrease noise with longer integration and good calibration frames. There’s a website which gives you the optimal ISO for your DSLR (sorry I can’t remember it, but someone might be able to provide the link). However, given the short integration, the higher ISO was probably the better option. Well done!
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