Chinese word

焦距

Pronunciation

Pinyinjiāo jù

Meaning

  • nounfocal length

Example

这台相机的焦距是多少？zhè tái xiàng jī de jiāo jù shì duō shǎo

What is this camera's focal length?

Illustration for 焦距 (focal length)

More examples

这支镜头的焦距范围是24-70mm。zhè zhī jìng tóu de jiāo jù fàn wéi shì 24-70mm

This lens has a focal length range of 24-70 mm.

Core concept

A lens measurement that marks how far its optical center is from its focus point.

Common phrases

  • 等效焦距děng xiào jiāo jù

    equivalent focal length

  • 镜头焦距jìng tóu jiāo jù

    lens focal length

  • 焦距范围jiāo jù fàn wéi

    focal length range

Similar words

焦点jiāo diǎn: The point where light rays meet and form an image.
镜头jìng tóu: An optical assembly that gathers light and forms an image.
光圈guāng quān: An opening in a lens that controls how much light enters.
相机xiàng jī: A device used to take pictures or record video.

Definition in Chinese

镜头或透镜将平行光汇聚到焦点时，镜头光学中心到焦点之间的距离，通常以毫米为单位表示。jìng tóu huò tòu jìng jiāng píng xíng guāng huì jù dào jiāo diǎn shí jìng tóu guāng xué zhōng xīn dào jiāo diǎn zhī jiān de jù lí tōng cháng yǐ háo mǐ wèi dān wèi biǎo shì

Word origin

焦距 (jiāojù, "focal length") is a modern technical compound in which 焦 (jiāo, "focus") specifies the optical point and 距 (jù, "distance") specifies what is measured.

Usage tips

  • A shorter measurement usually takes in more of a scene, while a longer one shows less, making this word useful when comparing wide and narrow views.

Related words

  • 等效焦距děng xiào jiāo jùequivalent focal lengthnoun
  • 标称焦距biāo chēng jiāo jùnominal focal lengthnoun

Word lists with this word