EOTech X320 User Manual - Manual (Page 24)

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Temperature units selected in the Temperature Units zone
applies to the temperature setting temperatures used in the
custom colorization settings.
Manual Touch-up instructs the camera to perform a single point
non-uniformity correction. Auto Touch-up calibrations occur
periodically for the first 120 seconds as the camera is warming
up unless turned off by the user in Camera Shutter Touch-up
zone.
Touch-up calibrations may improve image quality if the camera
has changed temperature or if the scene has drastically changed.
Default factory settings have Auto Touch-up enabled for the first
120 seconds (recommended) and then the max interval set after
that (32767 seconds). The camera automatically performs a
touchup when the camera changes temperature by 2°C. With
this setting one of the User Control Switch functions can be