Definition of guide number in English:

guide number

noun

Photography

A measure of the power of a flashgun expressed in metres or feet.
〔摄〕闪光指数（表示闪光灯的强度，用米或英尺表示）
Example sentencesExamples
- Such technical items as ‘guide numbers’ don't seem to matter any more.
- The guide number will enable you to calculate the correct aperture, simply divide the distance to the object by the guide number of the flash.
- Small flashes have guide numbers ranging from 45-80, while large shoe-mount units will be up to around 130.
- Unless you're shooting under those conditions, consider the guide numbers to be estimates.
- You can use a flash with coverage wider than the lens you are using with no change to the guide number.

Definition of guide number in US English:

guide number

noun

Photography

A measure of the power of a flashgun expressed in meters or feet.
〔摄〕闪光指数（表示闪光灯的强度，用米或英尺表示）
Example sentencesExamples
- Unless you're shooting under those conditions, consider the guide numbers to be estimates.
- You can use a flash with coverage wider than the lens you are using with no change to the guide number.
- The guide number will enable you to calculate the correct aperture, simply divide the distance to the object by the guide number of the flash.
- Small flashes have guide numbers ranging from 45-80, while large shoe-mount units will be up to around 130.
- Such technical items as ‘guide numbers’ don't seem to matter any more.

词汇	guide number
释义	Definition of guide number in English: guide number noun Photography A measure of the power of a flashgun expressed in metres or feet. 〔摄〕闪光指数（表示闪光灯的强度，用米或英尺表示） Example sentencesExamples Such technical items as ‘guide numbers’ don't seem to matter any more. The guide number will enable you to calculate the correct aperture, simply divide the distance to the object by the guide number of the flash. Small flashes have guide numbers ranging from 45-80, while large shoe-mount units will be up to around 130. Unless you're shooting under those conditions, consider the guide numbers to be estimates. You can use a flash with coverage wider than the lens you are using with no change to the guide number. Definition of guide number in US English: guide number noun Photography A measure of the power of a flashgun expressed in meters or feet. 〔摄〕闪光指数（表示闪光灯的强度，用米或英尺表示） Example sentencesExamples Unless you're shooting under those conditions, consider the guide numbers to be estimates. You can use a flash with coverage wider than the lens you are using with no change to the guide number. The guide number will enable you to calculate the correct aperture, simply divide the distance to the object by the guide number of the flash. Small flashes have guide numbers ranging from 45-80, while large shoe-mount units will be up to around 130. Such technical items as ‘guide numbers’ don't seem to matter any more.
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