You can get distorted projections with pinhole cameras too, as long as your sensor is curved. Fisheye is impractical, but cylindrical projections are easy. Comm

You can get distorted projections with pinhole cameras too, as long as your sensor is curved. Fisheye is impractical, but cylindrical projections are easy. Common way to do pinhole photography is with an oatmeal box, which is a cylinder. https://sdsu-physics.org/assets/PDFs/oatmeal_pinhole_camera.pdf https://sdsu-physics.org/assets/PDFs/oatmeal_pinhole_camera.... I'm not really trying to nitpick here, just like talking about pinhole cameras. With a flat image plane the pinhole lens is "rectilinear", but the beauty of pinhole cameras is that you can project the image onto any shape you want without affecting focus.