M31 - Andromeda Galaxy_revision2 - a photo on Flickriver

            Revision 2 increases contrast and reduces star size.

It took me about 4 hours to post-process this image.  Because of bad tracking and atmospheric turbulence, I rejected at least one-third of my images. I selected only ones where stars were bright and round.  My camera (DSLR DX) and lens have a resolution of about Pixel scale: 4.474 arcsec/pixel.  Most telescopes have a resolution of 0.5 to 2 arcsec/pixel with their CCD imaging.

Imaging lens: Nikon NIKKOR 180 F2,8 AIS ED

Imaging camera: Nikon d7100

Mount: ORION Sirius EQ-G

Guiding telescope or lens: Nikon NIKKOR 180 F2,8 AIS ED

Software: Noel Carboni's Astro Tools for PhotoShop Noel Carboni Actions,  PixInsight 1.8 Ripley PixInsight ,  Photoshop CS 6 Adobe

Resolution: 4544x2976

Dates: Sept. 11, 2015,  Sept. 25, 2016,  Sept. 26, 2016,  Sept. 27, 2016

Frames:
32x180" ISO1000
22x180" ISO1250
37x92" ISO1250
32x92" ISO2000
21x100" ISO3200
48x120" ISO3200
32x92" ISO800

Integration: 7.5 hours

Avg. Moon age: 25.44 days

Avg. Moon phase: 19.15%

Bortle Dark-Sky Scale: 3.50

Astrometry.net job: 1258828

RA center: 10.661 degrees

DEC center: 41.265 degrees

Pixel scale: 4.474 arcsec/pixel

Orientation: -90.005 degrees

Field radius: 3.375 degrees

Locations: Home observatory, Cheyenne, WY (elevation: 6014'), United States

Taken on: April 5, 2017

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Nikon d7100

Nikon 180mm f/2.8 « less

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