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What is the maximum range a sensor in the Lepton thermal sensor family can image?

The scene dynamic range (SDR) of the new Radiometric Lepton is 0-450 °C. This information should eventually be shown at the Lepton web page under the Specifications tab.

Above about 120 °C, the camera operates in a “low gain” mode in order to image higher temperature scenes. In low gain mode, the radiometric accuracy is specified to be the greater of ± 5 °C or 5% (typical).

The SDR of all the non-radiometric Lepton models is 120 °C.