Startrails of St Joseph's

I've been staying with my grandfather recently in the small country Australian town where I work so I decided to have another go of a startrail, this time in the school where I work as a teacher. The conditions were perfect as the sky was clear and the stars were out in force. The photo you see is the result of around 2.5-3 hours of 30 second exposures and then those photos 'stacked' together. I must say, I really like the end result, I hope you do as well! If you do have any advice on startrail photos such as, how do you set 'infinity focus' on a standard kit lense (I own a Nikon D5000 which has the standard VR 18-55mm) then please let me know! Cheers