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Hin David. The method that you are using works well all you have to do is keep adjusting the size of the ring to match the edge. The edge you have is not that bad and you could figure from what you have because when you parabolise the edge is somewhat turned anyway. Being F4.7 the parabolised curve is somewhat pronounced. I would still play it safe and remove a little more of the turned down edge. Here is a picture of a 10 inch F4.55. Compare the curve to you TDE.
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