Fisheye lens

Japanese: 魚眼レンズ - ぎょがんレンズ

〘Noun〙 (lens is lens) A type of photographic lens. A lens designed to capture an entire hemisphere of a subject with a 180-degree spread in a single circle. It is so named because it works on the same principle as fish can see a wide space due to the difference in refractive index between air and water. *Child of Nature (1968) by Kanai Mieko, volume 8 "The landscape spreads out in a strange shape as if seen through a fisheye lens."

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙 (レンズはlens) 写真レンズの一種。一八〇度の広がりをもつ半球全体の被写体を、一つの円形内に写せるように設計されたレンズ。魚が空気と水との屈折率の違いから、広い空間を見ることができるのと同じ原理によるところからこう呼ばれる。※自然の子供（1968）〈金井美恵子〉八「風景は魚眼レンズで見たように奇妙な形に拡がって」

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