focal ratio

美 [ˈfoʊkl ˈreɪʃioʊ]英 [ˈfəʊkl ˈreɪʃiəʊ]
  • 网络焦距比;焦比大
focal ratiofocal ratio

noun

1
the ratio of the focal length to the diameter of a (camera) lens system
Synonym: f number stop number speed

数据来源:WordNet

  1. The focal ratio of the Cassegrain system for the telescope is F / 10 and the plate scale is 20 ″ / mm .

    该望远镜卡焦焦比为F/10,底片比例尺为20〃/mm,无畸变象场约为1平方度天区。

  2. Study of the Tests of Large-aperture and Fast Focal Ratio Convex Hyperboloid Mirrors with a " Stitching " Method

    大口径快焦比凸双曲面拼接检测方法研究

  3. Focal point at the ratio of transmission calculating , every gear wheel torsion of the differential gear wheel system distributing and the Accident analysis and scheme of transforming for the stretcher straightener , We have carried on the detailed discussion to study .

    本文重点拉弯矫正机差速器传动系统的对传动比及效率计算、差速齿轮系统各齿轮扭矩分配、齿轮承载能力计算,气垫炉拉弯矫正机设备故障分析及改造方案进行了详细的讨论研究。