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Thanks guys for more thoughts.
Moon, there should be no flexure as this is with an off axis guider.
The more I look at this issue, the more that the idea occurs to me that it is the position of the flattener. I have checked through a heap of subs and the stars in the center are round. The stars further out get elongated.
So I now have to get the flattener into the correct position. Some comments from Tak owners would help to confirm my thoughts I guess.
All this just goes to show that one can have everythign going just right and make a component change and have to get everything sorted again.
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