Interesting thought about calibrating for distance. I’m actually a trained Flir user (15 years ago) but we used the technology for simply finding heat sources in the dark. Distance never effected our readings, but we weren’t concerned about specific temps either. We just fought about whether white or black should be “hot” on the monitor . Anyways I just bought a new stove and picked up a calibrated gauge to confirm the oven calibration. Once I’ve done that I’ll toss in one of my Icon motors, bring it to a calibrated temp and measure with my gun to find the distance. Just one more reason for the wife to think I’m nuts.