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Thanks for that reply Stephen.
When I look through the Ronchigrams on the Stellafane website it looks like a turned up edge gone slightly parabolic which also include those fine lines at the edge. There is also a hint of different turn in lines top and bottom which is problem i think.
I have trimmed up my lap a little reducing the oversize diameter hoping that will help but would like to find out more before i keep polishing.
Here are some images of out of focus owl eyes with less lines and close to in focus. Any further inside focus produces more and more lines as per the previous images.
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