Firefield NIGHTFALL 2, User Manual

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Distinct black dots appear on the screen.
These dots are minor cosmetic blemishes resulting from tube production processes and do not interfere with the
reliability or performance of the unit.
The unit flickers, flashes or “snows”.
The unit may flicker or flash when used in a bright environment; to correct this, place the cap over the objective
lens and enter a dark environment. The unit will restore itself to a natural fuctioning state in several minutes or hours,
depending on how long the unit was exposed to the light.
The unit may flicker for the first several seconds of use, even when in a dark environment, before the unit corrects
itself and funtions properly.
The unit may “snow” for several minutes after being exposed to a bright light source (daylight, car’s headlights, fire, ect.)
even if being operated in complete darkness.
The image is not focused.
Adjust the focus of the eyepiece and the objective (see “Use and Testing” section). Check that the lenses are not foggy
or dusty; if they are, carefully clean the external surfaces of lenses with a soft cotton fabric. Replace the batteries if the
total battery charge is less than 2.2V.
When the unit is brought into a warm environment from a cold one, condensation may appear on the internal lenses;
you must wait two hours before using the unit.