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A few Ronchi of my half polished little mirror inside and near focus and the owl eye outside of focus by nearly an inch.
You can see the outside owl eye focuses on the pyrex mould marks and edge rib on the back.
Sorry about the blurry ronchi.
The in focus look similar to Bartels part polished images except for the strange lines at the very edge . Perhaps the rib on the rear edge. Or the oversize lap , which is a bit of a handful to keep pressed.
Any more experienced thoughts welcome.
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