Canon XSi, modded, Total RGB 72 min. = 24x3 min, ISO 1600
BSPN 8" OTA at F2.8, EQ6 mount, guided w/PHD and EQMOD

Taken from Astrodon: http://dg-imaging.astrodon.com/gallery/display.cfm?imgID=185 and http://www.astrosky.it/index.php?id=217

A dark nebula is a type of interstellar cloud that is so dense that it obscures the light from the background emission or reflection nebula or that it blocks out background stars. The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of larger molecular clouds. Clusters and large complexes of dark nebulae are associated with Giant Molecular Clouds. Isolated small dark nebulae are called Bok globules. Dark clouds appear so because of submicrometre-sized dust particles, coated with frozen carbon monoxide and nitrogen, which effectively block the passage of light at visible wavelengths. The form of such dark clouds is very irregular: they have no clearly defined outer boundaries and sometimes take on convoluted serpentine shapes. The largest dark nebulae are visible to the naked eye, appearing as dark patches against the brighter background of the Milky Way. In the inner regions of dark nebulae important events take place, such as the formation of stars and masers.

Barnard 150 is a remarkable filamentary cloud within the Cepheus Flare in the constellation of Cepheus centererd at ~ RA 20h 51d and DEC +60d 16h. It is also known as Lynds (L1082) and GF 9 in the catalog of globular filaments by Schneider and Elmegreen (1979). In this image North is down. This object comprises 3 dense cores where new star formation is occurring.