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Second the advice not to align your images in PS! Bad idea! Anyway, you are going to eventually want to calibrate your images (darks, flats, bias), and stack multiple subframes- don't try this in PS either. Pixinsight is a great tool for this, Nebulosity is a cheaper tool (which can drive the camera too), and DSS is free. Good evidence here that you get what you pay for! Other software has been mentioned, and all of those packages have also been used to produce good images.
Cheers,
Andrew.
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