Group of French amateur astronomers, named Ciel Boreal (when
imaging under northern skies) or Ciel Austral (when presenting images
from their observatory located in Chile), is well know for top-quality
images of deep sky objects. And we are proud Laurent Bourgon,
Jean-Claude Canonne, Nicolas Outters, Philippe Bernhard and Didier
Chaplain use G4-16000 cameras with all their telescopes.
50 cm CDK telescope at the
Ciel Austral observatory in Chile
This time the group installed a 50 cm
CDK (Corrected Dall-Kircham) telescope with 340 cm focal length at their observatory in Chile. The
first light was the M83 galaxy, also known as the
Southern Pinwheel. Total exposure time was 25 hours, which is
pretty incredible, but sill this exposure time falls short compared to
hundreds of hours needed to capture narrow-band images of various
The image is composed from individual frames taken through red,
green and blue filters, providing color information, and image taken
without filter, which is used for luminance. What's more, another long
exposure image, taken through Hα filter is
used to emphasize the deep red hydrogen clouds in the galaxy.
For more details, visit the author's web site www.cielaustral.com.