How is a fisheye lens made differently from a normal ortholinear projection lens? How are real lenses acting differently from the ideal "thin lens" or pinhole, in terms of how the 3D scene in front is projected onto the focal plane?
To reiterate, how is a lens shaped differently from the traditional ground lenses in order to do this? "They do" is not an answer!
What does the profile of such a lens look like, and how do sample rays focus on a plane but distort the image? What mathematical concept is it based on?
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