FLIR ThermaCAM EX300 User Manual page 52

7 – Introduction to thermographic inspections of electrical installations
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Figure 7.21 Image from the viewfinder of a ThermaCAM 695
This effect is due to imperfections in the optics and to the size of the detector elements.
It is typical for all infrared cameras and can not be avoided.
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Publ. No. 1558439 Rev. a156 – ENGLISH (EN) – February 28, 2006