First Attempt at Star Trails

Looks like a spider web...

What were your settings, and how long were the exposures? Could do with grabbing more data on each shot really. I tend to go for 30s exposures at 18mm with everything wide open. I tried ISO800, 20s, and closed the aperture a couple of stops the other night, and the frames were a little too dark for my liking. At a very dark site it might be that you just need to expose for a bit longer each time.

Good start though...looks like a great location.

In fact, with a tiny bit of tweaking of the contrast, you captured a lot more there than meets the eye. -> http://img21.imageshac​k.us/img21/6244/startr​ails1817.jpg

Thanks for the suggestions.
I was shooting with my 40D and 17mm at F4 for 30s with ISO 100. I didn't have it on burst mode but was rather using my remote trigger as there were some random cars that went by even though it was fairly deserted. I did the stacking with JPEGs but wonder if I will get more detail with RAW.
It was a stack of 57 images so I don't know if I need more or less images to bring out a sharper view.
Would it be better to switch to my F2.8 to get more light?