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Graeme,
yep the results are very close to full frame. Any crop is only due to tracking
errors making the edge untidy after the stack. I crop before doing curves.
The Flat is true-full frame as shown below.
You are right, there is a gradient when I do a more severe stretch on it.
I should have rotated the flat to match the dust pattern on the light.
(my final result is rotated to put North at top).
Steve
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