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M81-M82 Widefield

The famous Messier pair of galaxies M81 and M82 appear together in this image taken with a 580mm refractor. M81, Bode's Galaxy, a grand spiral design galaxy, dominates the center of the frame, while M81, the Cigar Galaxy, shines to the left. Both galaxies show a significant Ha signal in this longer integration image.

ZWO ASI1600MM-C Camera @ -20C and
Gain:139 Offset:21
Software Bisque MyT Mount
Stellarvue SVQ100 Astrograph Refractor, 580mm @ f/5.8

Pixinsight Commercial Version 1.8
Lightroom CC
Photoshop CC

Light Frames:
Luminance: 100 x 90 secs (2 hrs 30 mins)
Red: 40 x 120 secs (1 hr 20 mins)
Green: 41 x 120 secs (1 Hr 22 mins)
Blue: 46 x 120 secs (1 Hr 32 mins)
Ha: 24 x 300 secs (2 Hrs)

8 hrs 42 mins total

Dark Frames:
20 x 60 secs (20 mins)

Bias Frames

Flat Frames
20 each filter

Additional Details from Wikipedia:
Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away, with a diameter of 90,000 light years, about half the size of the Milky Way, in the constellation Ursa Major. Due to its proximity to Earth, large size, and active galactic nucleus (which harbors a 70 million M☉[5] supermassive black hole), Messier 81 has been studied extensively by professional astronomers.
Messier 82 (also known as NGC 3034, Cigar Galaxy or M82) is a starburst galaxy approximately 12 million light-years away in the constellation Ursa Major. A member of the M81 Group, it is about five times more luminous than the whole Milky Way and has a center one hundred times more luminous than our galaxy's center.[7] The starburst activity is thought to have been triggered by interaction with neighboring galaxy M81. As the closest starburst galaxy to Earth, M82 is the prototypical example of this galaxy type.

M81-M82 Widefield