Antares astigmatism seen 08/01/12
1- far inside
3- near focus inside
4- near focus
5- near focus outside
6- near focus outside
7- far outside
8- full frame of # 7
9- full frame of # 3
10- cropped, enhanced of # 4 (best focus)
Movie of image taken during focusing: www.flickr.com/photos/48163385@N00/7700056168/
Needs more testing. Could see no aberration in diagonal when tested separately using 55mm scope. .
The size of the image spread at focal plain looks like 0.5 mm
Taken with Canon T1i at prime f/6, 180 inch focus. Star ALT = 18 º.
Equipment = X2 barlow with Canon T1i on a 30" Newtonian.