Luna Optics LN-ERS40M - Manual (Page 7)

Set the reticle illumination to the comfortable level (during daytime
sighting you may have to turn the Reticle brightness to its highest level).
View the position of the reticle through the rubber eyecup. If the reticle is
not in the center of the image, move it to the center by adjusting
(rotating) the scales of horizontal and/or vertical adjustments (7). Once
the reticle is in the center of view, align the weapon with the target, so
that the target is in the middle of the cross section of the reticle. Make the
control shot. Observe the bullet impact on the target and, if necessary,
make additional corrections via horizontal and vertical adjustment wheels.
If necessary, repeat the shots until you can see the correlation between
adjusting the scales and the bullet impact. Once finished, replace the
scale covers and (if sighting at night) close the protective lens cover. Do
not forget to switch the unit to the OFF position.
TROUBLESHOOTING:
1. Unit does not turn on:
a) Please check if the battery is inserted according to the
drawing
b) Please make sure the battery is good
c) You may be turning the unit on in a very dark area with the
lens cover still on the unit
d) You may have turned the unit on in a very well lit area
without the lens cover and the unit has shut off for
protection – immediately turn off the unit and do not turn it
back on until you are in the dark condition.
2. Unable to obtain sharp and clear image:
a) You may need to repeat the process of rotating the ocular
focusing wheel (3) and distance focusing wheel (2) several
times until you get a good feel of it
b) You may be viewing an object that it too close – the
minimum focusing distance is approximately 5m or 16 ft
c) You may have dirty objective or ocular lens – you may clean
them with soft lens cleaning cloth
3. There are black dots (specs) in the field of view:
THIS IS NORMAL – BLACK DOTS ARE MICROSCOPIC
PARTICLES INSIDE THE TUBE AND RESULT FROM THE
TUBE MANUFACTURING PROCESS, WHICH IS NEVER
COMPLETELY SPEC-FREE
IMPORTANT INFORMATION:
NEVER:
1. Intentionally turn on the unit without protective lens cover during
daylight or in a well-lit area
2. Take precaution not to allow direct projecting light into the
objective lens (automobile headlights, flashlight beams, laser
beams)