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

Processing:

  • 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.

 
M17 (Omega Nebula)
SaratogaSkies Jim Solomon's Astropics

Search

Latest news

December: Test shots with new scopes/mounts

Dec 21: TMB 80/480 Arrives!

Dec 3: AP1200 Arrives!

Nov 30: TMB 152/1200 Arrives!

Links:

M17 (Omega Nebula)   [obsolete]

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: 30 x 1min @ ISO 800
Total Exposure: 0hrs, 30min
Date: 7/12/2004, ~11pm PDT
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: None
Guiding: None

Processing:

  • IRIS: Dark subtraction, flat frame, registration, and Kappa-Sigma stacking
  • Photoshop: Color mixing, Image scale (1/4 x), JPG conversion

Image Description:

Yet another stunning object in the "summer" Milky Way. This is the Omega Nebula (aka Swan Nebula) in the constellation of Sagittarius. This is a Sigma stack of the best 30 of the 42 frames (the remaining 12 showed trailing/smearing due to tracking error). I cranked up the red a bit in Photoshop to compensate for the Digital Rebel's poor sensitivity to Hα, the main wavelength emitted by nebula such as this one. The real solution to this problem is to hack apart the camera and remove the IR filter ... in other words, destroy the camera. No thanks. North is up.