This mosaic consists of two parts with 6x900s and 4x900s each. Focal length was 660mm at f/5.2. A color camera QHY8L with 7.8mu pixels was used. More infos at: http://en.wikipedia.org/wiki/California_Nebula
The fantasy starts where science fiction ends. Stay awake and discover a reality full of shapes and colors in the north part of the sky, somewhere in the Cepheus constellation.