Zoom lens

Japanese: zoom lens(英語表記)zoomlens
Zoom lens

...Usually, it is common for a lens to capture an area within a circle of a certain radius on the film, but there are also lenses that capture the entire rectangular film size, just like a normal lens, and these are called diagonal fisheye lenses. (8) Zoom lens A lens whose focal length changes continuously without any change in focus. The most commonly used type is the so-called four-group zoom system. ...

*Some of the terminology explanations that mention "zoom lens" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…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。(8)ズームレンズzoom lens 連続的に焦点距離が変わるが,その際ピントの変動のないものをいう。 もっとも一般的に用いられているのが,いわゆる4群ズーム方式と呼ばれるものである。…

※「zoom 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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