Thanks for the replies. I missed doing darks etc when I stripped a thread whilst placing the guide scope on so I didn't really have time when I finally got set up. Plus I wanted to see how it would go (new toy excitement and all that). I'll do them tonite, promise
Thanks Troy, I'm really pleased with the scope. Gave my boy the best view of saturn tonight. The primary school is teaching space at the moment, so he was chuffed at being able to see these things first hand.
Daz, callibration is all the images used to remove camera noise and imperfections in the optics (dust, vignetting etc). Others could explain it all better than me, I'm just starting out in all this.