Astronomy and astrophotography under California stars
The Trifid Nebulae
M20, the Trifid Nebula, taken with a 10-inch Ritchey-Chretien telescope and a Canon EOS 5D Mark II. Click for a larger version.
Other Names/Objects
Optics Deep Sky Instruments RC10C 10" Corrected Ritchey-Chrétien Telescope at f/7.3
Mount Astro-Physics 900-GTO German Equatorial Go-To Mount on ATS portable pier
Camera Canon EOS 5D Mark II (unmodified) at ISO 1600
Exposure 42 minutes (7 x 6 minutes)
Calibration 10 darks | 15 flats | 0 bias
Air Temperature 48°F
Accessories Autoguided with Orion StarShoot Autoguider and Canon 200mm lens with 2x telextender
Location Julian, California (Julian Starfest)
Date August 7, 2010
Notes Processing: Image acquisition with Canon EOS Utility. Image calibration, align, and combine in ImagesPlus 3.75. Levels, curves, sharpen, noise smoothing (Noel Carboni's PS Tools), crop, and resize and save as JPG in Photoshop.

Larger versions:
1800 x 1200 (~1.9 MB)