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I agree Slawomir however that gives a gradient inside focus that is twice that of outside focus and that makes no sense to me. I understand the V should be reasonably symmetric around the focus point. I think the answer is to reduce the number of steps between points to something like 10 and aim to get 4 or 5 points either side of the focus point but close enough so the gradient isn't influenced by strange star shapes or donuts.
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