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M31 (highlighting regions with Ha, processing with subtraction (Ha - R))Oct 28th, 2025
12 h 35 m
Improved processing by applying the Siril HDR_multiscale script. Plus culling of the source frames.
M31 (highlighting regions with Ha, processing with subtraction (Ha - R))
- Resolution:
- 5663x3232 px
- File size:
- 3287 KB
Photo description / processing
Improved processing by applying the Siril HDR_multiscale script. Plus culling of the source frames.
Technical information
- Telescope/Lens
- Askar SQA 85 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
- Location
- Петушки, Владимирская область, Россия
Light pollution
Orange, Bortle 6 zone
- Date taken
Exposure
- 155 × 180″ · ISO/Gain: 100 · RGB
- 58 × 300″ · ISO/Gain: 100 · Askar D1 DUO (Oiii+Ha) 6 нм
Total exposure: 12 h 35 m
Photo versions
M31 (highlighting regions with Ha, processing with subtraction (Ha - R))
Sep 17th, 2025
20 h 8 m
Pixel math was used in Siril to add narrowband H-alpha (Ha) data to the broadband RGB image. That is, the pure emission signal can be isolated from the Ha data by subtracting the continuum contribution, which allows Ha to be added to the image without changing the color balance. The result is a large number of nebulae in M 31 that contain hydrogen alpha.
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Comments
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The BB didn't drift away—this is an attempt to make the colors more expressive with warmth and tone.
Thank you.
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Thank you.
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But there is a result in any case.
The H_alpha regions are well highlighted.
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