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It is very unlikely that 800 was the wrong choice, as the minimum noise sweet spot on most DSLRS lies between 800 and 1600; my Canon 1100D is 1600, and my 600d is 800. From memory I think many budget and mid level Nikons are around the 800 to 1000 mark. The Rosette is far from an ideal target for an unmodded DSLR. You are also using a small scope with limited light gathering power. My 8" Newt brings
out a lot more red than is contained in your image using far shorter subs with my unmodded 600D and no filter.
raymo
Last edited by raymo; 11-12-2021 at 11:54 AM.
Reason: more text
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