Matty, you need to expose for a few mins to get the nebulae. I see you have an 80 tube too, is it mounted on the Celestron?, can you use that to autoguide?. And yes, of course with the RGB filters you can build a colour pic ;-). Get your self an Astro application, itll stack and process darks and make it easy. Photoshop is de rigure then for tweaking, a must.
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