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Characterization of focusing efficiency. (A) Schematic of experiment. (B) Imaging efficiency of f = 19 mm lens with Tau 2 camera core as a function of the object (hot plate) temperature. (C) Peak wavelength corresponding to a blackbody temperature using Wein’s law, showing that efficiency peak occurs for temperatures of 50 °C, which corresponds to m. (D) Exemplary point-spread function at 50 °C (raw data).
