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並前往https://www.flir.co.uk/support-center/oem/what-is-the-relationship-between-lens-f-number-and-camera-performance-or-nedt/

What is the relationship between lens f-number and ... - FLIR

A simple formula can be used to calculate how the NEdT of a thermal imager will be affected by changing the f/number. The formula involves 3 variables:.

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