Imaging telescopes or lenses: C9.25
Imaging cameras: Moravian Instruments G3-16200 Mark II
Mounts: 10 Micron GM1000 HPS
Guiding cameras: 10Micron HPS System
Software: Seqence Generator Pro · Pixinsight
Filters: Baader Planetarium R 2" · Baader Planetarium G 2" · Baader Planetarium B 2"
Dates:April 22, 2020
Frames:
Baader Planetarium G 2": 44x300" bin 1x1
Baader Planetarium R 2": 44x300" bin 1x1
Baader Planetarium R 2": 44x300" -25C bin 1x1
Integration: 11.0 hours
Avg. Moon age: 28.98 days
Avg. Moon phase: 0.34%
Bortle Dark-Sky Scale: 7.00
Mean SQM: 17.50
Astrometry.net job: 3454874
RA center: 14h 3' 11"
DEC center: +54° 21' 31"
Pixel scale: 0.514 arcsec/pixel
Orientation: 90.099 degrees
Field radius: 0.390 degrees
Resolution: 4368x3294
Locations: Castenedolo, Castenedolo, Italy
Data source: Backyard
As for my previous picture of M99
the imaging session of this M101 was intended to test the latest gradient correction technique by Vicent Peris.
(the link to the original article can be found in the description of my M99 image)
M99 was a small target: the gradient correction is quite easy, so the idea was to test it on a larger target.
Here the reason why I choose M101.
IMHO this technique is going to be a MUST for city imagers
In version B you can see a direct comparison between original and corrected image
In version C you can see the large field image used for gradient modeling.
I took it with a Canon 60D at 800 ISO and an Letiz Elamrit - R 180 mm F 2.8 at F/4
140 x 20 sec subs.
Description: The reference image from the Canon 60D with the 180 mm lens used as a reference for the gradient modeling.
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