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A comment on Imaging Without Lenses. Parent comment

Re:Imaging Without Lenses by hliyan on Monday February 05, 2018 @12:29PM (#16310334)
I thought so too. But apparently that doesn't give you a _point focus_, rather a square focus, which doesn't work.
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Re:Imaging Without Lenses by sp332 on Monday February 05, 2018 @12:36PM (#16310374)
Ok, I get it. A circular mirror focuses all directions equally, while two cylindrical ones focus only exactly left-right and exactly up-down correctly, leaving every diagonal out of focus to varying extents.
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