M81, M82 (highlighting regions with Ha, processing with subtraction (Ha - R))

 Posted: Jun 17th, 2026
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Technical Info
Telescope/Lens: Askar SQA 85 мм f/4.8
Camera: ZWO ASI 183 MC Pro
Mount: Ioptron HAE 29 C
Guide Scope: Askar 52 мм F4
Guide Camera: ZWO ASI 120 MM mini
Software: SharpCap 4.0, Siril, GraXpert
Exposure:
61 x 300" ISO/Gain: 120 - RGB
45 x 300" ISO/Gain: 120 - zwo Ha 7 нм
White, Bortle 8/9 zone:
 Petushki Vladimirskaya Oblast, Russia
 Jun 3rd, 2026
8 h 50 m
293
Resolution: 3727x2467 px
Scale: 4278 KB
Added data in Ha, captured with a ZWO ASI 183 MM camera and combined with last year's material that was shot with a color ZWO ASI 183 MC. After all, with the light pollution as it is now, narrowband imaging gives at least some result. Used pixel math in Siril to add the narrowband H-alpha (Ha) data to the broadband RGB image.
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