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Originally Posted by rmcpb
Great and simple but I would suggest that people should at least measure the diameter of their mirror and make the arcs just over the radius otherwise someone will make their arcs too big and actually draw on their mirror in the area that catches the light and wreck their mirror.
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Yes, that is a good tip if you don't trust your eye. I did the mirror in the photos without any measurements, but the secondary obstruction was quite large for this f5, so there was no real risk of marking the mirror in the wrong place.