Hmm, i believe this is likely the problem - I guess i will try pointing the camera straight up for some extra alignment.. I just bought an old Pentax SUper Takumar 135mm prime lense, which should help me reduce the time needed for noticable drift too.. Of course, looks cloudy for the foreseeable future!
Quote:
Originally Posted by joecool
You are seeing exaggerated errors I believe when you move the camera away from the SCP. As a test I mounted my 450D using the 18-55 lens at 20mm unguided on a tripod with 30sec exposures the other night. At the SCP the stars are pretty round, but on Orion setting in the west the stars are 1cm long lines!
This page I have found to be an excellent description
http://www.astrophotoinsight.com/pub...d-drift-method
but swap south for north.
Mark. |