NGC6888 and The Soap Bubble Nebula 
Scope: Deep Sky Instruments RC10c 254mm @ f/7.4 / FL= 1880mm Corrected Ritchey Chretien  
Camera: FLI- ML11002M with FLI (7 position filter wheel CFW-5-7) 
Total Exposure: Ha=(41) 20min subs Total= 13.7 hrs....OIII=(17) 30min subs Total= 8.5 hrs {BiColor Process} + 1.5 hrs each of RGB.
June 2013: Chico, California, USA 
Comments: NGC-6888 (lower left of image), the Crescent Nebula is an emission nebula in Cygnus and was discovered by William Herschel in 1792. It lies 5,000 light-years away and is approximately 25 light-years across. The nebula is lit up by a Wolf-Rayet star known as WR-136. The star is shedding its outer envelope in a strong stellar wind which is colliding with much slower moving gasses in this already rich nebulous region. There are two shockwaves involved. One is going in while the other is going out. One day, it is predicted that the central star will go supernova.    Also, in the upper right area of this image is the recently discovered "Soap Bubble Nebula."