f-number

f-number

美 　英

  • n.焦距比數；〔光〕f 數；【攝影】光圈數；焦比
  • 網絡光圈值；F數；光圈大小

詞形變化

復數：f-numbers  

英漢解釋

n.
1.
焦距比數
2.
〔光〕f 數,光圈數
3.
【攝影】光圈數
4.
焦比

英英解釋

n.

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.

數值愈小表示通過的光量多，F數值是焦距長和有效開口的比值。

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，可從鏡頭的焦距與焦距比數中計算出來。

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

在同樣距離上拍攝的兩張相片，使用更小的光圈F值可以獲得更淺的景深。

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.

人像模式用一個大光圈（f值小），而讓景深（清晰對焦的那部分）變小。

F number means that quantity of light pass through lens.

數值是光通過鏡頭量大小的表示。

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

拍攝過程中選用大光圈，這能模糊背景，從而關注水。

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

寬視場大相對孔徑星敏感器光學系統設計

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

使用F-數字制測定樓板平正度和水平度的試驗方法