Horsehead is a beautiful but difficult to image nebula because of the bright star Alnitak.
Imaged with the Moravian G3-16200 at my Takahashi FSQ 106. L:R:G:B:HA=150:120:120:120:360 minutes. Subexposures were 10 minutes for LRGB and 30 minutes for HA.
Processing with PixInsight and Photoshop CS6.