Luna Optics LN-EM1-MS - Manual (Page 5)

position the image is at its best. After that, rotate the
Objective Lens (1) also until the image is at its best. You may
have to repeat the process again, until the image is sharp and
clear. Once the clear image is obtained, you no longer need to
adjust the Ocular Ring, just rotate the front objective lens ring
to adjust according to the distance of the object you are
viewing.
USING INFRARED ILLUMINATOR:
Your night vision monocular is equipped with a built-in 2-stage
Infrared illuminator light (2). This light operates in a spectrum,
which is invisible to a human eye, however with the help of the
tube, located inside the unit, you will see a beam of light when
looking though the ocular lens. This Infrared light is here to
assist your viewing over the very short distances in especially
dark conditions, where there is not enough light for the tube to
amplify.
To turn the Infrared illuminator on, first turn on the unit by
rotating the Switch (3) one dial to ON position and then you must
slide forward the top moving plate of the switch and at the same
time rotate the switch (3) one more dial to IR position. Please
note that if you do not slide the top moving plate of the switch,
you will not be able to switch on the IR illuminator. This feature
preserves the battery life by preventing accidentally turning on
the IR light. When looking through the Eyecup (6), you will
notice a little red indicator turning on – this is to remind you that
the infrared light is on. You may further rotate the Switch (3) to
IR+ position to increase the brightness of the IR illuminator
(IMPORTANT: to switch between IR and IR+ positions you are not
required to slide the top moving plate of the Switch.
To turn the infrared light off, press the same button again and
make sure the red light indicator in the field of view is off.
When using the built-in infrared illuminator it is important to
remember that it is only meant to be used on very short
distances. As the distance increases, the intensity of the
infrared light fades away.
AUTOMATIC GAIN CONTROL:
Please note that the unit is equipped with the special Auto-Gain
control, which would not allow you to turn on the unit without