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Old 11-06-2012, 01:09 PM
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tlgerdes (Trevor)
Love the moonless nights!

tlgerdes is offline
 
Join Date: Mar 2009
Location: Sydney
Posts: 2,284
Think you need to try again but focus on a star in the centre, not the edge, that way you can measure curvature which I think is whay you are seeing at the moment.
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