Fisheye lens

Japanese: fisheye lens(英語表記)fisheyelens
Fisheye lens

...The optical path is folded three times, making the total length of the lens much shorter than the original focal length. (7) Fisheye lens A fisheye lens intentionally has a large barrel distortion in order to capture a subject with a field of view of 180 degrees or more within the size of the film screen. Usually, a fisheye lens captures an image within a circle of a certain radius on the film, but some lenses capture the entire rectangular film size, just like a normal lens; these are called diagonal fisheye lenses. ...

*Some of the terminology that mentions "fisheye lens" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…光路は三重に折りたたまれることになり,本来の焦点距離に比べるとレンズの全長を非常に短くできる。(7)魚眼レンズfisheye lens 画角180度,あるいはそれ以上の被写体の広がりを,フィルムの画面サイズ内に写し込むため,意図的に大きな樽型の歪曲収差をもたせてある。通常,フィルム上一定の半径の円内を画面にとるものが一般であるが,普通レンズと同じように,矩形のフィルムサイズいっぱいに写し込むものもあり,これは対角線魚眼レンズと呼ばれる。…

※「fisheye lens」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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