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Spiral Galaxy M81, Ursa Major | by crowlem

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Spiral Galaxy M81, Ursa Major

Another showpiece spiral, also known as NGC 3031 or Bode's Galaxy, in Ursa Major.
40 x 2-minute exposures, ISO 3200, f/4 (frames taken 25 March 2020); plus 7 x 5-minute, f/4, ISO 1600 (older frames, from November 2013). Modified EOS 600D & Revelation 12" Newtonian f/4 reflector telescope.
Frames registered and stacked in DeepSkyStacker software; curves adjusted in Canon Photo Professional; noise reduction in CyberLink PhotoDirector.

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Uploaded on March 30, 2020

Taken on March 25, 2020

Spiral Galaxy M81, Ursa Major

Another showpiece spiral, also known as NGC 3031 or Bode's Galaxy, in Ursa Major.
40 x 2-minute exposures, ISO 3200, f/4 (frames taken 25 March 2020); plus 7 x 5-minute, f/4, ISO 1600 (older frames, from November 2013). Modified EOS 600D & Revelation 12" Newtonian f/4 reflector telescope.
Frames registered and stacked in DeepSkyStacker software; curves adjusted in Canon Photo Professional; noise reduction in CyberLink PhotoDirector.