Referring to the original post; ISO 1600 is too high for suburban skies. Try using ISO400 and slightly shorter subs. You could also use ISO800 but this will produce some noise, which can be cancelled out by lots of subs and good darks.
A dedicated CCD will give you better results but at this stage I think it is important for you to get images you can process and learn about processing. Good data collection makes for easy processing. So get the data collection going first and then work on the processing.
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