focal length

US 
UK 
  • n.焦距
  • Web镜头焦距；焦距长度；焦长
Plural Form：focal lengths  

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Web Definition

focal length
n.
1.
焦距the distance between the centre of a mirror or a lens and its focus

Sample Sentence

Definition:
AllAll,焦距焦距,镜头焦距镜头焦距,焦距长度焦距长度,焦长焦长
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard
1.
Spot diameters of just a few thousands of an inch can readily be attained with convenient short focal length lenses.
用普通的短焦距透镜不难得到直径只有几十微米的光点。
yòng pǔ tōng de duǎn jiāo jù tòu jìng bù nán dé dào zhí jìng zhǐ yǒu jǐ shí wēi mǐ de guāng diǎn 。
2.
The focal length you need depends on your distance from the burst and what you're trying to capture.
你所需要的焦距取决于你和被拍摄焰火间的距离，以及你想捕捉到怎样的画面。
nǐ suǒ xū yào de jiāo jù qǔ jué yú nǐ hé bèi pāi shè yàn huǒ jiān de jù lí , yǐ jí nǐ xiǎng bǔ zhuō dào zěn yàng de huà miàn 。
article.yeeyan.org
3.
Use angle encoder calibration coefficient of deviation of the long focal length of high-precision tracking system was satisfactory results.
利用编码器标定角偏差系数的方法，在长焦距高精度跟踪系统中获得了满意的效果。
lì yòng biān mǎ qì biāo dìng jiǎo piān chā xì shù de fāng fǎ , zài cháng jiāo jù gāo jīng dù gēn zōng xì tǒng zhōng huò dé le mǎn yì de xiào guǒ 。
www.ceps.com.tw
4.
Objective and the focal length of the specimen to be measured. The measurement of the size of the reticle.
十字线的像的尺寸取决于准直仪物镜的焦距和待测样品的焦距。
shí zì xiàn de xiàng de chǐ cùn qǔ jué yú zhǔn zhí yí wù jìng de jiāo jù hé dāi cè yàng pǐn de jiāo jù 。
www.opticaltest.com
5.
To determine power, divide the focal length of the telescope (in mm) by the focal length of the eyepiece (in mm).
将望远镜的焦距（单位：mm）除以目镜的焦距（单位：mm），就可以得到望远镜的放大率。
jiāng wàng yuǎn jìng de jiāo jù ( dān wèi : mm ) chú yǐ mù jìng de jiāo jù ( dān wèi : mm ) , jiù kě yǐ dé dào wàng yuǎn jìng de fàng dà lǜ 。
article.yeeyan.org
6.
The focal length of the condensing lens should be such that the image of the source just fills the projecting lens.
聚光透镜的焦距应使光源的像正好照满放映透镜。
jù guāng tòu jìng de jiāo jù yīng shǐ guāng yuán de xiàng zhèng hǎo zhào mǎn fàng yìng tòu jìng 。
www.kuenglish.info
7.
If you know the FOV, sensor size, and working distance, you can compute the focal length of the lens you need using the following formula.
如果你知道视野FOV，感应器大小，和工作距离，你能用以下之方程式去计算你所需之镜头的焦距。
rú guǒ nǐ zhī dào shì yě FOV , gǎn yìng qì dà xiǎo , hé gōng zuò jù lí , nǐ néng yòng yǐ xià zhī fāng chéng shì qù jì suàn nǐ suǒ xū zhī jìng tóu de jiāo jù 。
iask.sina.com.cn
8.
It can be used to really evaluate the optical performance and imaging characters at any focal length of a zoom system.
可借助该程序对变焦系统任意焦距位置的光学性能和像差特性进行实时评估。
kě jiè zhù gāi chéng xù duì biàn jiāo xì tǒng rèn yì jiāo jù wèi zhì de guāng xué xìng néng hé xiàng chà tè xìng jìn xíng shí shí píng gū 。
www.magsci.org
9.
Using a longer focal length and photographing stars far from the north star increase the distance stars will move across the image.
使用长焦镜头拍摄远离北极星的星星，会增加星星在相片上移动轨迹。
shǐ yòng cháng jiāo jìng tóu pāi shè yuǎn lí běi jí xīng de xīng xīng , huì zēng jiā xīng xīng zài xiàng piàn shàng yí dòng guǐ jì 。
article.yeeyan.org
10.
Or, you can calculate the exit pupil by dividing the focal length of the eyepiece (in mm) by the focal ratio of the telescope.
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。
huò zhě , nǐ hái kě yǐ jiāng mù jìng de jiāo jù chú yǐ wàng yuǎn jìng de jiāo bǐ lái dé dào chū tóng chǐ cùn 。
article.yeeyan.org
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