SaratogaSkies Jim Solomon's Astropics


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M16/M17/M24 (Widefield)

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Image Details:

Camera: Mofidied Canon Rebel XT (350D): Hutech Type I Filter Replacement
Mount: Celestron AS-GT
Scope: Canon EF 200mm f/2.8L II USM lens
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: None
Effective Focal Length: 200mm
Effective Focal Ratio: f/2.8
Exposure: 8 x 4min @ ISO 200
Total Exposure: 0hrs, 32min
Date: 8/24/2005 9:28:26 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


  • IRIS: Dark subtraction, registration
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
  • Photoshop: Levels, image scale, JPG conversion

Image Description:

This is "Second Light" for my new, modified, Canon EOS Digital Rebel XT (350D). (First Light is available as well.) I was only able to get 8 exposures in before the marine layer (fog) wiped me out, but the modified camera captured a decent amount of Hα from these relatively bright targets in that relatively short window. This is a well-traveled field in Sagittarius containing several of the showcase Messier objects of summer: M16 (the Eagle Nebula), M17 (the Omega Nebula), and M24 (Sagittarius Star cloud), plus some other goodies. This is the full frame, shrunk for display on the web. A full resolution image is also available. North is right.