SaratogaSkies Jim Solomon's Astropics


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M27 (Dumbbell Nebula)

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
Date: 7/11/2004, ~3am PDT
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: None
Guiding: None


  • 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.