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a.k.a. "The Propeller Nebula" in Cygnus.
6x600s exposures through an H-alpha filter, using an STL-11000M and Takahashi TOA150 apo refractor. Aligned, stacked & sigma clip combined in MaximDL5Pro, processed in Photoshop CS3, gradient removal using Gradient Xterminator, and noise removal using Noel Carboni's Astronomy Tools. I was surpirsed by the brightness of the not only the Propeller, but also the extensive nebulosity surrounding the main subject!
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