EOTech LWTS Light Weapon Thermal Sight - Manual (Page 33)

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2.11 AUTOMATIC GAIN CONTROL (AGC)
The LWTS provides an Automatic Gain Control (AGC)
feature that, when turned on, automatically adjusts both the
thermal brightness and gain levels based on the contrast
visible in the viewed scene.
AGC is toggled on or off by pressing (and holding) the
POL/AGC button. AGC status (AGC ON or AGC OFF) is
presented in the lower right corner of the eyepiece display
(see Figure 2-9).
With AGC OFF, continual adjustments to both thermal
brightness and gain must be made manually as described in
sections 2.9 and 2.10, to improve and maintain image
quality.
Operating the LWTS with AGC ON usually provides the best
thermal image. Manual adjustments to thermal brightness
and gain can still be made with AGC ON, but to a smaller
degree (fine tuning only).
2.12 FOCUS ADJUSTMENT
The objective lens must be focused for the viewing distance
being observed. Rotate the objective focus ring for best
image clarity. A change in viewing distance requires that the
lens be refocused. However, if already focused for a
distance of at least 90m, no change in focus is required
between this distance and infinity.