f-number

单词f-number

基本解释

n.: 焦距比数；〔光〕f 数；【摄影】光圈数；焦比
网络: 光圈值；F数；光圈大小

英汉解释

• 焦比

• 【摄影】光圈数

• 〔光〕f 数,光圈数

• 焦距比数

词性分析

• 复数：f-numbers

例句

• The more light pass through, the lower F number is. Shown in the following figure, F is the ration of focal length and effective diameter.

  数值愈小表示通过的光量多，F数值是焦距长和有效开口的比值。

• The aperture size (area of the aperture) of a lens could be calculated from focal length and the correspondent f-number.

  光圈孔的大小，可从镜头的焦距与焦距比数中计算出来。

• For two pictures taken at the same distance, the lower f number will give you a shallower depth of field.

  在同样距离上拍摄的两张相片，使用更小的光圈F值可以获得更浅的景深。

• Portrait mode chooses a large aperture (a small "f" number) which will make the depth of field (the amount of your shot in focus) smaller.

  人像模式用一个大光圈（f值小），而让景深（清晰对焦的那部分）变小。

• F number means that quantity of light pass through lens.

  数值是光通过镜头量大小的表示。

• When shooting, use a high F-number, this will help to blur the background and focus on the water.

  拍摄过程中选用大光圈，这能模糊背景，从而关注水。

• Optical System Design of Star Sensor with wide-view field and Small F-number

  宽视场大相对孔径星敏感器光学系统设计

• Test Method for Determining Floor Flatness and Levelness Using the F-Number System

  使用F-数字制测定楼板平正度和水平度的试验方法