M20
Technical information
- Telescope/Lens
- PlaneWave CDK24
- Camera
- QHY600M
- Mount
- PlaneWave L-600 Direct Drive
- Software
- Siril, GraXpert, Adobe Lightroom
- Location
- Observatorio El Sauce Rio Hurtado, Chile
Light pollution
Green, Bortle 4 zone
- Date taken
Exposure
- 3 × 300″ · ISO/Gain: 0 · R ·
- 6 × 300″ · ISO/Gain: 0 · G ·
- 3 × 300″ · ISO/Gain: 0 · B ·
- 3 × 300″ · ISO/Gain: 0 · L ·
- 30 × 300″ · ISO/Gain: 0 · Ha ·
Total exposure: 3 h 45 m
Photo versions
M20 Trifid Nebula
May 1st, 2026
3 h 45 m
I worked on Labor Day. I combined R + Ha using a median of 1.5 to avoid noise from hydrogen in the background. Then processed it like a regular LRGB. No masks or star removal, luckily there aren't many stars here. Lately, I only stretch GSH on the background between stars, trying not to touch the nebula itself, or just stretching the darkest parts of the frame. I think I'll revisit this stack later.
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