In the course of the calibration process the image freezes on the screen – this is normal and not a defect.

Default calibration mode is “Automatic” (the software decides when calibration is necessary) but you can change it to “Manual” mode in the “Main menu” => “Calibration mode” to calibrate the binoculars when you need to based on actual image quality. Please close the lens cover prior to manual calibration. We recommend using automatic mode all the time.

Please read more about calibration in the user manual for your thermal device.