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M27 (Dumbbell Nebula)
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| Click to see high-res version. |
Image Details:
- Camera: Canon Digital Rebel (300D)
- Mount: Celestron AS-GT
- Scope: Celestron C8-N (8" f/5 Newtonian)
- Configuration: Prime Focus
- Additional Optics: n/a (Prime)
- Filter: None
- Effective Focal Length: 1000mm
- Effective Focal Ratio: f/5
- Exposure: 60 x 1min @ ISO 800
- Total Exposure: 1hrs, 0min
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- Date: 7/11/2004, ~3am PDT
- Location: Saratoga, CA, USA
- Acquisition: DSLRfocus
- Focus: DSLRFocus
- Dithering: None
- Guiding: None
Processing:
- IRIS: Dark subtraction, flat field, registration, Kappa-Sigma stacking
- Photoshop: Cropping (1/2 x), image scale (1/2 x), JPG conversion
Image Description:
Ahhhh, now that's what this amazing object is supposed to look like, as opposed to a previously wasted attempt at too long a focal length. A 30% waning-crescent moon had risen about 22° above the horizon by the time the last of the 60 frames was shot, but it didn't appear to spoil the result. This is half of the full-frame image to provide a reasonable close-up of the nebula. A higher-resolution image is also available. North is up.