Apochromat

Japanese: apochromat
Apochromat

...This is called the secondary spectrum. A lens that corrects chromatic aberration for monochromatic light of the third wavelength is called an apochromat, and is used in high-magnification microscope objective lenses and super-telephoto lenses (focal length of 200 mm or more for 35 mm cameras). [Masao Tsuruta]...

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これを2次スペクトルという。第3の波長の単色光に対しても色収差を補正したレンズをアポクロマートapochromatと呼び,高倍率顕微鏡対物レンズや超望遠写真レンズ(35ミリカメラ用で焦点距離200mm以上)などに用いられる。【鶴田 匡夫】。…

※「apochromat」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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