M33 (highlighting regions with Ha, processing with subtraction (Ha - R))

 Posted: Nov 3rd, 2025
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NGC
IC
HD
Technical Info
Telescope/Lens: Askar SQA 106 мм f/4.8
Camera: ZWO ASI 2600 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:
122 x 180" ISO/Gain: 100 - RGB
43 x 180" ISO/Gain: 100 - Askar D1 DUO (Oiii+Ha) 6 нм
Orange, Bortle 6 zone:
 Adygeya Stanica Dahovskaya, Russia
 Sep 26th, 2025
8 h 15 m
771
Resolution: 2902x1847 px
Scale: 760 KB
Pixel math was used in Siril to add narrowband H-alpha (Ha) data to a broadband RGB image. This means the pure emission signal can be isolated from the Ha data by subtracting the continuum contribution, allowing Ha to be added to the image without changing the color balance.
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