Ｆナンバーの英語

The zoom lens has at least a first lens group having a negative refractive power and a second lens group having a positive refractive power, and achieves a wide angle and a high variable power ratio and a compact size, and small variation of F-number by properly using first F-number determination means and second F-number determination means for each zoom position.例文帳に追加

負の屈折力の第１レンズ群、正の屈折力の第２レンズ群を少なくとも有し、ズームポジションごとに第１のFナンバー決定手段および第２のFナンバー決定手段を適切に使い分けることで、広角・高変かつコンパクトでFナンバー変動の小さいズームレンズ - 特許庁

To provide a zoom lens advantageous to make a wide field angle compatible with a large aperture, more concretely, to provide a high-performance zoom lens simultaneously realizing such a wide field angle as a half viewing angle of ≥45° and an F-number showing brightness such as about F2.8.例文帳に追加

広画角化と大口径化の両立に有利なズームレンズ、より具体的には、半画角が４５°以上の広画角化と、Ｆ２．８程度の明るいFナンバーとを同時に実現できる高性能なズームレンズを提供する。 - 特許庁

To provide a compact zoom lens which has excellent optical performance all over the zoom area and all over the object distance, has a wide angle and a high variable power ratio, and has small variation of F-number, and to provide an optical apparatus having the same.例文帳に追加

全ズーム域・全物体距離にわたって良好な光学性能を有する広角・高変倍比かつFナンバー変動が小さいコンパクトなズームレンズおよびそれを用いた光学機器を得ること - 特許庁