Great Globular Cluster in Hercules M 13

 Posted: Dec 27th, 2024
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Technical Info
Telescope/Lens: Sky-Watcher 150/750
Camera: Canon 200 Da
Mount: HEQ5 Pro
Software: APT, DeepSkyStacker, FitsWork, FITStacker, Lightroom, StraNet2GUI, Photoshop, Topaz Denoise AI
Accessories: Bahtinov mask
Exposure:
101 x 10" ISO/Gain: 3200
157 x 15" ISO/Gain: 1600
Red zoneLight Pollution:
 Chelyabinsk, Russia
 Nov 22nd, 2024
56 m
634
Messier 13 globular cluster in Hercules
(NGC 6205, GCL 45, Great Cluster in Hercules)
Galaxy NGC 6207

Equipment and software:
Camera Canon EOS 200 Da.
Telescope Synta SkyWatcher 150/750, F/5
Mount HEQ-5 Pro
Bahtinov mask
Astrophotography Tool, EQ-Mode, ASCOM, Cartes Du Ciel

Imaging session 1 from 12-13.09.2024, Kremenkoul area
Red light pollution zone. Bortle scale class 7
101 Light frames of 10 seconds + 10 Dark frames + 10 Bias frames
ISO 3200

Imaging session 2 from 22.11.2024, Kremenkoul area
Red light pollution zone. Bortle scale class 7
157 Light frames of 15 seconds + 40 Dark frames + 40 Bias frames
ISO 1600

Total integrated exposure Σ=0h56'5"

Processing: DeepSkyStacker, FitsWork, FITStacker, Lightroom, StraNet2GUI, Photoshop, Topaz Denoise AI
Resolution: 6024x4020 px
Scale: 5660 KB
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Comments

Indeed. The downside of modified Canons is that when shooting star clusters (and not only), they heavily skew the color balance toward yellow-orange.
28 Dec, 2024 Reply
Googolplexplex Replied to Scuttum
There's a lot to consider there. I tried to normalize the white balance in FitStacker using the star's BV index as a reference, but it's tricky with this one. If you just look at it visually, I've seen processed versions of photos of M 13 with the blue region, the yellow region, and they all look noticeably different. Personally, I felt this version here looked best this way.
29 Dec, 2024 Reply

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