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6. OPERATION INSTRUCTIONS
WARNING!
NEVER TURN ON THE NIGHT VISION CHANNEL IN
DAYLIGHT AREAS WITHOUT THE LENS COVERS ON!
NEVER DIRECT THE LENSES IN THE DIRECTION OF
BRIGHT LIGHT!
6.1. Pre-starting procedures. Unpack the device. In order to use
the device at night, unscrew the battery house covers (4), and install
the batteries. Observe the correct polarity indicated on the housing.
Close the battery house cover.
6.2. Daytime operations. Move the switch (5) to the Day
position (letter “D” is visible). Open the lens covers (1). Aim the
device to any distant object and try to achieve the sharpest image by
eyepieces rotating. Each eye adjusts independently. Adjust the
interpupillary distance by folding and unfolding the device around the
central hinge until two images merge into one. If you wear glasses fold
the eyepiece rubber guards (9) to obtain closer focus distance.
6.3. Night channel testing. Check the functioning of the device
by switching it on (press and hold button 7) and looking through the
eyepieces (8). (Make sure the lens caps are on in a daytime). If the
batteries are installed and function properly, you will see greenish-lit
screen. If the screen is not lit, check the batteries. Replace the batteries
if necessary. If everything works, now it is a great time to fill the
warranty card.
Note: The unit will remain on for up to several minutes after releasing
the power button. This is normal.
6.4. Nighttime operations. Take off the lens covers (1) from the
lenses (2). Turn the device on by pressing and holding the ‘On’ button
(7). Aim the device to an object placed within 8-15m from you.
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Warning! After transportation or keeping the device at
temperature lower than -25°C (-13°F), the device must be warmed
up to ambient temperature for at least 2 hours.
Precautions
BDN 7x50 is a sophisticated precision optical instrument equipped
with electronics. Therefore, it should be handled with due care.
♦ Keep your device away from direct sunlight, impacts, dust,
moisture, and sudden changes of temperatures.
♦ Cleaning of optical surfaces is possible only with professional
camera lens cleaning supplies.
♦ Do not touch optical surface with fingers. Doing so may
damage the anti-reflection coating.
♦ To clean the exterior of the device, use only a soft clean cloth.
♦ Do not take the covers off the lenses if not necessary.
♦ Keep away from heating appliances and central heating.
♦ Make sure to switch off the unit during periods of non-
operation and when storing the device for long period.
♦ Do not apply superfluous efforts at work with lens assembly,
agile elements and thread connections.
Due to considerable optical magnification of the eyepieces some
small structures inside the tube coating may be seen in the field of
view in the form of dark and/or white points, which does not affect
the serviceability of the device
At night, the resolving power (resolution) may change in the
direction from the center towards the perimeter of the field of
view. This is an inherent feature of the image intensifier tube type
utilized in the device. We would recommend placing the scene of
observation in the center of the field of view.
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