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great image Jarrod - very tidy and dramatic.
the 1600 has such low read noise that it doesn't matter all that much how many reads you do - ie you can take very short subs if you choose to. If you were imaging under moonlight for the Ha, the short subs were OK, but you could consider longer ones under dark sky - FWIW, I am getting near to sky noise limited performance using 10 minutes on Ha and O3 at f4 and gain 200.
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