M33 (highlighting regions with Ha, processing with subtraction (Ha - R))
Posted: Nov 3rd, 2025
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Technical Info
Telescope/Lens:Askar SQA 106 мм f/4.8
Camera:ZWO ASI 2600 MC
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 zoneLight Pollution:
Adygeya Stanica Dahovskaya, Russia
Sep 27th, 2025
8 h 15 m
204
24
Pixel math in the Siril program was used to add narrowband H-alpha (Ha) data to a broadband RGB image.
That is, it is possible to isolate the pure emission signal from the Ha data by subtracting the continuum contribution, which allows adding Ha to the image without altering the color balance.
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