Circumpolar Stars
Fig. 23: This picture of circumpolar stars is made of 112 single exposures with an interval of 40 seconds and exosure time of 30 seconds. The lower part is used for creating a timelapse. I just realized later that there are no standard movie formats in portrait aspect ratio. Telescope meeting, Ahornalp. Nikon D3; Δt=30 s; f=19 mm; f/4.0; ISO 3200; 23 May 2009 00:37:05