"The Horse Head Dark Nebula in Orion". Combined images from Oct 2013 and Oct 2014. Nikon D300 mounted on a Celestron EdgeHD 11" SCT with f/6.3 focal reducer. Image processed from 4 minutes sub-exposures (18 exposures) and 5 minutes sub-exposures (9 exposures) for a total of 2 hours of imaging. ISO800.