Calibration eliminates image flaws (such as vertical bars, phantom images, grainy field of view, etc.) by equalizing the microbolometer background temperature.
There are three calibration modes: manual (M), semi-automatic (SA) and automatic (A). Select the required mode in the Calibration Mode 
item.
M mode (manual)
- Close the lens cover (12) and press the ON/OFF (3) button briefly.
- Open the cover after the calibration is completed.
SA mode (semi-automatic)
- Press the ON/OFF (3) button briefly to activate calibration.
- There is no need to close the lens cover (internal shutter covers the microbolometer).
A Mode (automatic)
- The riflescope is calibrated autonomously according to the software algorithm.
- There is no need to close the lens cover (internal shutter covers the microbolometer).
- In this mode, the riflescope may be calibrated by the user with the ON/OFF (3) button.
Note: a display image freezes until the calibration is in progress.
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