1.  focal ratio
2.  coke ratio

• 1. 焦比: F-number | coke ratio | focal ratio | coke rate
• 2. 数位变焦比率: DigitalZoomRatio
• 3. 变焦比: zoom ratio | zooming ratio | MHz

更多释义

• 1.快焦比的主要优点在于可以提供一个更宽的视角。
  The main advantage of fast focal ratios with a telescope used visually is a wider field of view.
  dict.yoduao.com
• 2.或者，你还可以将目镜的焦距除以望远镜的焦比来得到出瞳尺寸。
  Or, you can calculate the exit pupil by dividing the focal length of the eyepiece (in mm) by the focal ratio of the telescope.
  dict.yoduao.com
• 3.当观察扩展光源时，目镜中所看到的亮度只跟孔径和放大率有关，它跟焦比并没有关系。
  When viewing extended objects, the apparent brightness seen in the eyepiece is a function only of aperture and magnification, it is not related to focal ratio.
  dict.yoduao.com

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