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M81, M82 - Galaxies in Ursa Major
M81, M82 - Galaxies in Ursa Major
Pascal


Photograph Information Photographer's Comments
Camera: Canon EOS-350D Rebel XT
Location: Kariani, Greece
Date: Apr 7, 2008
Aperture: f/7.5
ISO: 800
Shutter: 105 min (total)
Galleries: Sky, Astrophotography
Date Uploaded: May 9, 2008

Viewed: 487
Comments: 3
Favorites: 0

 Image scope : Celestron ED80
Guide scope : Celestron C8 SCT
Mount : Takahashi EM200 Temma II Jr
Guiding Software : PHD Guiding
Exposure details : 25x4min + 1x5min

The FOV of the final image is cropped (71% of the original image size)

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AuthorThread
 05/11/2008 07:35:43 PM
Thanks for the info. Sounds a little out of my realm of knowledge for now but it does help explain why there are no star trails.
  Photographer found comment helpful.
 05/11/2008 07:19:37 AM
Star trails won't appear under some certain conditions. At first the mount has to be well balanced. Next step is a carefull polar alignment and finally the autoguiding of the mount is correcting slight imperfections. The whole procedure is quite hard sometimes and demands patience and precision.
The Takahashi EM200 mount if the 1st and 2nd condition are satisfied, is capable of delivering 4 to 5 minutes of unguided exposure, for the given focal length of the imaging scope (600mm).
05/10/2008 12:16:58 AM
Pretty sweet image. How did you avoid Star Trails with a 105 minute exposure?
  Photographer found comment helpful.


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