Fisheye lens - Wikipedia
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Olympus Zuiko Digital ED 8mm f/3.5 Fisheye - Wikipedia
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When would you us a fish eye lens and what effect will it have on the photo? - Quora
Fisheye lens - Wikipedia
File:Fisheye-foto.jpg - Wikimedia Commons
Are fisheye lenses just for fun, or can they have practical applications too? - Quora
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