Caldwell 4
Photo description / processing
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.
Technical information
- Telescope/Lens
- Sky-Watcher BKP 130/650
- Camera
- Canon EOS 550D (astro-modified)
- Mount
- Sky-Watcher EQ3 (OnStep)
- Guide Scope
- svbony sv165 f4
- Guide Camera
- Asi 120mm mini
- Accessories
- ZWO ASIAIR Plus, Bahtinov Mask
- Software
- Siril, Pix
- Location
- Praha, Чехия
Light pollution
Red, Bortle 7 zone
- Date taken
Exposure
- 52 × 35″ · ISO/Gain: 800 ·
Total exposure: 30 m









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