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Scorpius & Rho Ophiuchi Cloud Complex - Lake of Two Rivers, Algonquin Park

We had one good night of clear skies during our camping trip to Mew Lake in Algonquin Park. The seeing was acceptable but not great due to a light haze, despite the nice dark sky. This was taken looking out over Lake of Two Rivers on Thursday, July 20th to the accompaniment of howling wolves and relatively few mosquitoes. I'm actually not pleased with this image. The constellation Scorpius lies low and just above the horizon viewed from this latitude, meaning we see this marvelous cloud complex at a low slant angle though the Earth's thick and turbulent atmosphere, which filters the blue wavelengths resulting in a rather monotone image. Still, the stars are in reasonably sharp focus and the dark nebula structure looks good. This is a stack of 16 light frames (I recorded about 40 but most were ruined by meteors and aircraft!) taken at ISO 1600 for 30 seconds at f/2.0, 16 dark frames made in-camera (long exposure noise reduction), 11 flat frames and 10 bias frames, using my trusty Sigma 50mm ART lens and Canon 70D mounted on my iOptron SkyTracker. The images were stacked using DeepSkyStacker, with the final product processed in Lightroom.

 

en.wikipedia.org/wiki/Rho_Ophiuchi_cloud_complex

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Uploaded on July 25, 2017