This is my first attempt at capturing a globular cluster at long focal length with my C8 EdgeHD, as well as the first light from the new ZWO ASI533MC Pro under a thin crescent Moon (17% illuminated) and I am pretty impressed with the results! I chose Messier 4 as this is one of the most prominent globular clusters that the southern skies have to offer under the barrage of light pollution from the CBD relative to my location in Sengkang.
Telescope: C8 EdgeHD
Imaging Camera: ZWO ASI533MC Pro
Filter: Optolong L-Pro
Light: 159x30s
Dark: 50
Flat: 50
Bias: 40
Plate-solved image:
Object location:
In terms of post-processing, I had some difficulties in getting rid of the green bias in the fainter stars in the cluster as a result of the RGGB bayer matrix in colour cameras. I finally resorted to creating a star mask for these faint stars and adjusting the colour balance to my liking of a bluish tint, although their true colours would be closer to red since most stars in a globular cluster are red dwarfs.
You may also find the image on my Astrobin site at https://www.astrobin.com/txfgsc/
Any feedback are welcome! Clear skies everyone~
M4 in Scorpius
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Re: M4 in Scorpius
Beautiful!
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Re: M4 in Scorpius
Nice and sharp stars and colors!
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- Posts: 81
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- Favourite scope: Skywatcher Esprit 100ED
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- Posts: 81
- Joined: Wed Aug 22, 2018 5:16 pm
- Favourite scope: Skywatcher Esprit 100ED
Re: M4 in Scorpius
Thanks!
- Airconvent
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Re: M4 in Scorpius
Nice effort! I like the superimposed guide too
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