NGC 2264. Christmas tree nebula

 Posted: Dec 26th, 2025
Technical Info
Telescope/Lens: SkyWatcher 200/1000PDS
Camera: ZWO ASI585MC Pro
Mount: HEQ5 Pro
Guide Scope: ZWO OFF-AXIS-GUIDER
Guide Camera: Zwo ASI 120 MM
Software: Siril
Accessories: Asiair plus. Narrowband filter Ha +OIII 7nm
Exposure:
60 x 180" ISO/Gain: 120
Green, Bortle 4 zone:
 Vasalema , Estonia
 Dec 26th, 2025
3 h 0 m
171
Resolution: 3770x2094 px
Scale: 39614 KB
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Comments

Hi Andres, nice photo. Why you have such big halos on stars? What narrowband filter you use?
Also check Gain for your 585 camera. With filters and latest firmware from ZWO it definitely will be better to use gain 200 with narrowband filters. Check zwo website and page about asi585mc pro with graphs for DR. Using gain 120 is wrong scenario. If you want to shot in LCG use gain around 50. Otherwise 200 will be best chose.
1 Jan, 2026 Reply

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