A very noisy M51, with one problem solved. This is a stack of 15, 4-minute exposures. I did a freelance job that paid for a new dovetail bar & rings for the ST80 guide scope, and I am very happy with them. Goodbye guide scope flex, hello long autoguided exposures!
Now, about all that noise. I did shoot 4 darks that improved things some, but probably could have used more. I need to read more about bias frames and such, too. Summer's nearly here, and the camera gets noisier as it gets warmer.
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