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M13 - Globular Cluster in Hercules
M13 - Globular Cluster in Hercules
Pascal


Photograph Information Photographer's Comments
Camera: Canon EOS-300D Rebel
Location: Kariani, Greece
Date: Jul 11, 2005
ISO: 1600
Shutter: 30 sec
Galleries: Science and Technology, Astrophotography
Date Uploaded: Jul 14, 2005

Viewed: 598
Comments: 2
Favorites: 0

 This is perhaps the most difficult kind of image to achieve; my telescope (Celestron C8 SCT Advanced GoTo) became a huge lens for the Canon 300D. The method is called "prime focus" and in order to be successful it is necessary a perfect polar allignement and perfect focusing. Weather conditions and light pollution are also crucial.
M13 lies 25000 light years away, at the constellation of Hercules, the greatest hero of Greek mythology. It contains approximately 300000 old stars (comparable with the accepted age of the Universe).


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AuthorThread
 07/26/2005 06:01:36 PM
Thank you John, I am glad for these good words!
The method was polar allignment and unfortunately it was not perfect. For more than 35 seconds there were star trails, so I was limited at 30 seconds exposure time and maximum iso.
I forgot to mention the use of a focal reducer (f/6.3).

07/16/2005 01:07:04 AM
Outstanding shot for iso 1600 and 30 sec! Truly amazing. Alt/Az or polar alignment??
  Photographer found comment helpful.


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