Night view of the school

I had many proplems with this panorama (my first night one):

    my fisheye lens was not perfectly clean and I got lots of stains in halos around lamps. This problem didn't show at all in daylight shots

    CCD noise was quite high (Coolpix 990, 8 seconds shutter speed, ISO 100)

    The pillar required to combine 4 shots (between 1/4 s and 8) to be evenly lit...