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hliyan
on Feb 5, 2018
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Imaging Without Lenses
I thought so too. But apparently that doesn't give you a _point focus_, rather a square focus, which doesn't work.
sp332
on Feb 5, 2018
[–]
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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