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M20 (Trifid Nebula)
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Image Details:
- Camera: Mofidied Canon Rebel XT (350D): Hutech Type I Filter Replacement
- Mount: Celestron AS-GT
- Scope: Celestron C8-N (8" f/5 Newtonian)
- Configuration: Prime Focus
- Additional Optics: Celestron/Baader Multi Purpose Coma Corrector (MPCC)
- Filter: None
- Effective Focal Length: 1000mm
- Effective Focal Ratio: f/5
- Exposure: 17 x 4min @ ISO 400
- Total Exposure: 1hrs, 8min
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- Date: 8/29/2005 9:03:35 PM PDT (start)
- Location: Saratoga, CA, USA
- Acquisition: DSLRfocus
- Focus: DSLRFocus
- Dithering: Manual
- Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow
Processing:
- IRIS: Dark subtraction, registration
- JimP: Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
- Photoshop: Levels, cropping, JPG conversion
Image Description:
This is a "do over" of M20, the Trifid Nebula, in the constellation of Sagittarius. The Modified camera did an excellent job at capturing the Hα (deep red) color in the nebula, while also capturing the blueish/greenish tones in the reflection nebula. My previous attempt at M20 is still available, that one with an unmodified camera. This is the full frame, shrunk for display on the web. A full-resolution image is also availble. North is up.