[Mosc_007 (Charles)]

Tried out my Ha filter on the Horsehead Nebula last night. Does make a huge difference as the Ha filter leaves no sky glow. The Red stars are caused by the Ha filter.

6 Subs at 5 Min each. Celestron C11 with F6.3 Focal reducer. Modded Canon 1100D. Taken at Linden 19/09/2014

As suggested I separated the RGB Channels and added an Image of just the red channel in B&W.