Focus issues
I am having issues with focus on a Celestron 11" HD and the reading I have done suggests that the OTA may not be cool enough. I have attached a couple of pictures of Antares which is the best focus I could get using live view focus on a laptop and prime focus. The second and third pictures are what I think is either side of the 'best focus' I could get. It was taken with a Canon 700 D. Is this thermal currents which are causing the star to look like a blob or is there some other possible cause? The pictures were taken about an hour after the scope was set up.
Any ideas would be greatly appreciated.
Brian
Last edited by brisen; 01-10-2013 at 06:53 PM.
Reason: Added a couple of extra photos
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