MIT and UMass researchers develop world's first flat ultra-wide-angle fisheye lens: Digital Photography Review
The Difference Between FISHEYE and Wide Angle Lenses - YouTube
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Why don't more people use fisheye lenses as a cheap wide angle lens? - Photography Stack Exchange
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Rectilinear lens - Wikipedia
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Arducam M12 Lens Kit for Raspberry Pi High Quality IMX477 Camera, Fisheye Wide Angle Telephoto M12
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