ngc 6888 and PNG 75.5+1.7 in Cygnus, HaL+HaR+O3GB
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Finally, the composite of H alpha, O3, and the RGB image. I used the earlier Ha image to create both an HaR channel, and the Luminance channel. I used the
O3 image to create O3G and O3B channels and then combined them with layers essentially as Craig and Tammy described a while back for Ha-HaR. The addition of
the O3 image had little effect though. The bubble is slightly visible in O3, but I was not successful in bringing out the thin overall haze of blue.
North is mostly up in this image, and the elusive bubble is just low left of center. Without any doubt, this was the most difficult subject
I have attempted. The bubble is not visible in a single sub frame and is pretty hard to find in a stack after stretching. It is only faintly visible in the
RGB image without the Ha. The images were collected over several nights from June 19th through July, with the last O3 in early August.

I referred to some images by Dietmar Hager for color advice on the background and the Crescent...
 Telescope Explore Scientific David H. Levy Comet Hunter Maksutov-Newtonian 152mm f/4.8 mounted piggyback on Meade LX 200 Classic 12 inch
Camera Canon XT/350d modified with Baader type 1 filter by Hap Griffin with 13nm Astronomik H alpha and O3 filters.
Exposure 440 minutes for H alpha, 380 miinutes for O3, and 345 minutes for RGB, all at iso 1600
 Guiding  PHD Guide from Stark labs with Meade DSI pro I on Meade 12-inch LX 200 Classic at f/3.3
 Software Images acquired, calibrated, stacked and color corrected with Nebulosity 2.3.2 from Stark Labs. Final stacking and processing in Photoshop CS 3.
on-line links to more information   for more information try Googling ngc 6888 and or PNG75,5+1.7. there is new stuff every day..