Lecture 16: Camera & Lenses Cont. (8)

That looks a bit like an astigmatism, where if you have a with the rule astigmatism it is more difficult to read words as it blurs up and down, while against the rule astigmatism makes it blur left and right which makes it even more difficult to read. MY question is, an astigmatism is "cured" when the eyes is almost a pure circle, with no longer axis, so why can't we do that with cameras?

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