SaratogaSkies Jim Solomon's Astropics


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M3 (Globaluar Cluster)

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Image Details:

Camera: SBIG ST-2000XM
Mount: Astro-Physics 1200GTO
Scope: TMB 152/1200 APO Refractor
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: Astrodon LRGB I-Series Filters
Effective Focal Length: 1200mm
Effective Focal Ratio: f/7.9
Exposure: {9L, 8R, 8G, 8B} × 4min @ -20°C
Total Exposure: 2hrs, 12min
Date: 6/01/2008 11:00:48 PM PDT
Location: Saratoga, CA, USA
Acquisition: CCD Commander
Focus: FocusMax
Dithering: CCD Commander
Guiding: Self Guided


  • IRIS: Registration, gradient removal
  • JimP: Dark subtraction, Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
  • CCDSharp: Deconvolution
  • Photoshop: JPG conversion

Image Description:

This is M3, a Globular Cluster in the constellation of Canes Venatici. The seeing was absolutely horrible the night this was shot, so I used CCDSharp to deconvolve it. Seems to have worked reasonably well, without producing too many artifacts. A higher-resolution image is also available. North is up.