f-number

f-number

美 　英

• 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

词形变化

复数：f-numbers  

英汉解释

n.	1. 焦距比数 2. 〔光〕f 数,光圈数 3. 【摄影】光圈数 4. 焦比

英英解释

n.	1. the ratio of the focal length to the effective diameter of a camera lens.

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