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Antares astigmatism seen 08/01/12 | by edhiker
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Antares astigmatism seen 08/01/12

1- far inside

2- 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)

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Movie of image taken during focusing: www.flickr.com/photos/48163385@N00/7700056168/

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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.

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Uploaded on August 2, 2012