Moderator Hard Challenge: Any target in H-alpha  
the crescent bubble ngc 6888 and PNG75.5+1.7 in Cygnus.

the crescent bubble ngc 6888 and PNG75.5+1.7 in Cygnus.(chuck kimball)

Acquisition Date : several nights from June 20 through August 12
Camera : Canon 350d modified with Baader uv/ir filter by Hap Griffin. Astonomik 13 nm clip filter for Ha
Camera Settings : Raw 440 minutes total exposure
Telescope : Explore Scientific David Levy 152mm Maksutov-Newtonian
Mount : piggyback on Meade LX 200 classic 12-inch, guided through 12 inch at f3.3 with Meade DSI Pro I and PHD from Stark Labs
Adapter / Prime / Afocal / Other : prime focus, f/4.8
Processing Package / Processing Applied : acquired, calibrated and stacked with Nebulosity 2.3.2, final contrast and jpeg with photoshop cs3
Web Site : chucks astro site
NOTES : a very difficult subject...

Position 2 overall, due to these votes:
Vote for this image:3 votes


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