see also:
source: low level lighting for astroscapes
Above: my astroscape from Craig's Hut using the Olympus mZD 8mm f/1.8 Pro fisheye lens
Nice pano stitch of 10 images at f/2.8, ISO 3200, 15sec, but the Tokina 11-16mm f/2.8 lens is showing awful image quality at the tops of each frame - lens choice is critical!