...The value obtained by dividing the back focus by the focal length is called the retro ratio, or inverse telephoto ratio, and the shorter the focal length of the wide-angle lens, the larger the value. (5)Telephoto type This is a method used to shorten the overall length of a lens relative to its focal length. If a convex lens system is placed in the front group and a concave lens system is placed a considerable distance away, the rear principal point will protrude further forward into the air than the front lens group. This results in a lens system with a longer focal length compared to the overall length of the lens. *Some of the terminology that refers to "telephoto type" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…バックフォーカスを焦点距離で割った値をレトロ比,あるいは逆望遠比と呼び,焦点距離の短い広角レンズほど大きな数値となる。(5)テレフォトタイプtelephoto type 焦点距離に対し,レンズの全長を短くするために用いられる方式であって,前群に凸レンズ系を置き,かなり距離を隔てて凹レンズ系を置くと,後側主点が前群レンズよりさらに前方の空中に飛び出す。こうしてレンズ全長に比べて焦点距離の長いレンズ系が得られる。… ※「telephoto type」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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