Thanks for the comments. I wasn't sure what to expect from 1.5 hrs but though a lot more time would be required. In terms of the framing, it was pretty late (early?) and I couldn't even see the horse in the live view when I was setting up the shot so to be honest I'm happy I wasn't pointing the telescope at a random star field for 1.5 hrs. I've got a baseline to build on and definately intend to give this area another try.
What should I be doing about the contrast? I gave it another iteration of curves and levels and the graininess set in - I guess more data is the answer?
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