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Nice one Marty,
I am assuming this is a crop? it would be better if you put up the full frame.
a great start. I would pump the iso up to 1600 and shorten the exposure especially if you are shooting in Mitcham and if you haven't got the light pollution filter going yet. I found down in mt eliza I was maxing out with sky glow at 70 seconds on an f4 newt (iso 1600) - that's moved out to about 3 mins or so with a light pollution filter (iso 1600).
double check collimation, and make sure you recheck focus during the imaging sesh. I'm not sure how sturdy your focuser is .. more experience in processing.
did you take flats?
Cheers
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