Caldwell 4

 Posted: Sep 7th, 2026
Show astrometry on hover
NGC
IC
HD
Technical Info
Telescope/Lens: Sky-Watcher 130/650BKP
Camera: Canon 550da
Mount: Sky-Watcher EQ3 OnStep
Guide Scope: svbony sv165 f4
Guide Camera: Asi 120mm mini
Software: Siril, Pix
Accessories: ASIair plus, bahtinov mask
Exposure:
52 x 35" ISO/Gain: 800
Red, Bortle 7 zone:
 Praha, Czech Republic
 Sep 6th, 2026
30 m
4
Resolution: 3464x2309 px
Scale: 9533 KB
Well, this is the first test of the ASI Plus. Initially, there was an issue with polar alignment because, for some reason, the mount wasn't moving, but I think I sorted it out. Unfortunately, in Bortle 7, half an hour of exposure on Iris is not much—I'll gather more in the future. Also, I remembered that I've been using Bakhtinov mask for half a year now.
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