As for the first shot, that is normal when using a telephoto and multi-second exposure. Believe it or not, the Earth moves enough in 10-15 seconds to cause star trails in photos.
Nicely done Steve, especially the second one in the OP.
I did look for this here in the UK with a view to taking some photos, I saw the beautiful new moon with earthshine, but could not locate the comet due to some cloud
I'd planned to watch this one a bit more closely, but so far almost no luck with the weather over here + I live near a major city, so there is some significant light pollution, making it difficult to observe near-horizon objects.
I used the new Nikon D600 my wife gave me for Christmas. For the wide angle shots, I used a Tokina 17-35mm lens, and for the telephoto ones I used a Nikon 70-300mm.
Those are pretty awesome snaps Saw your Photography link on signature some great snaps you got there . I am still on my basic level trying to learn some photography .