Here is my second try at HST palette narrowband but this time using my QHY12 One Shot Colour CCD. The target deserves longer than the 5m/300s exposures I used (and more of them!) but am pretty happy for a single evenings imaging over a couple of hours.
Darks applied, no flats or bias. Stretch & Star Reduction in PixInsight. Channels, Levels and Noise Reduction in Photoshop.
Celestron Edge HD 9.25" / Hyperstar III lens + filter drawer system / Baader F2 high speed Filters / EQ6 Pro mount w/ EQMOD, Stellarium & Astrotorilla. Acquisition and stacking in Nebulosity 3 & 4.
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Higher Res (2048px wide / 1.6mb) / Less Compressed Image :
http://deography.com/tmp/ROSETTE-HST.jpg