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Dual Tube Night Vision Goggle/Binocular
D-221 / 321
User’s guide
Night Optics USA, Inc.
!WARNING!
Do not operate this device until you
are familiar with the contents of
this manual. Keep this manual in a
safe place for future reference.
This Night Vision Device should
only be used during night or low
light conditions. It contains a lightsensitive image intensifier tube
that can be damaged if exposed to
excessive light. To prolong tube life
and avoid damage, do not turn the
unit on in daylight without the protective cover.
This Night Vision Device is
equipped with a built-in IR illuminator that can be seen by other Night
Vision Devices when it is turned on.
Use this feature with caution.
This device will not show the difference between colored lights. It
produces only a green viewing image. When color differentiation is
needed, verification with unaided
2
eyes is recommended.
All Image Intensified Devices re-
quire some light to operate such
as moonlight or ambient starlight.
Night vision devices will not penetrate smoke, fog, rain, or heavy
snowfall. Cloud cover and tree
shadows will reduce the effectiveness of this device.
Do not operate this Night Vision
Device in a potentially explosive
environment near gasoline fumes
or other volatile materials. This is a
high voltage electrical device.
Do not disassemble, puncture, recharge, or expose the battery to
fire or high temperature. Doing so
may result in an explosion and resulting chemical burns. When the
device is not in operation for a prolonged period, remove the battery
from the device and keep it separately in a cool and dry place.
TABLE OF CONTENTS
Introduction 3
Technical Specifications 4
D-221G/321G (goggle configuration) 4
General View And Description
Of D-221/321 5
Operation 6
1. Battery Installation 6
2. Controls 7
3. Lens Replacement (optional) 7
4. Head Mount Attachment 8
Night VisionCharacteristics 9
Maintenance 10
Troubleshooting 12
Warranty 13
Limitations of Liability 14
Acceptance Certificate 15
INTRODUCTION
Thank you for purchasing the D-221/321 dual
tube night vision
goggles/binocular.
The following list contains all items included in
the D-221/321 package:
• D-221/321 (see below)
• Battery
• Carry case
• Manual
The D-221/321 can be configured as either
goggle or long range binocular. In the goggle
configuration this unit comes with 1x lenses and
headgear for hands-free operation. In binocular
configuration, the D-221/321 comes with 3x
lenses for long range observation. An integrated
IR light source can be switched on to enable
operation in complete darkness.
TECHNICAL SPECIFICATIONS
D-221G/321G (goggle configuration)
Image Intensifier
Resolution
Magnification 1x (3x optional)
Lens System 26mm f1.2
FOV
@1000 yards
@1000 m
Range of Focus
Detection Range
Recognition Range
Diopter Adjustment +4 to -4
Weather Resistant Yes
Camera Adaptable No
IR Illuminator Yes
Battery Type/Life CR123/30 hours
Dimensions
Weight 21 oz / 600 grams
Operating Temp.
3
4
Generation 2+(D-221)
3 US (D-321)
28 to 38 lp/mm (D-221),
45 to 64 lp/mm (D-321)
40˚
2099’
640 m
10” to infinity
25 cm to infinity
738’ (D-221)/1066’ (D-321)
225 m (D-221) /325 m (D-321)
492’ (D-221)/902’ (D-321)
150 m (D-221) /275 m (D-321)
4”x5.8”x2”
109mm x 149mm x 55mm
-4° F to 113° F
-20°C to +45°C
D-221B/321B (binocular configuration)
Image Intensifier
Resolution
Magnification 3.2x (1x optional)
Lens System 80 mm f1.6
FOV
@1000 yards
@1000 meters
Range of Focus
Detection Range
Recognition Range
Diopter Adjustment +4 to -4
Weather Resistant Yes
Camera Adaptable No
IR Illuminator Yes
Battery Type/Life CR123/30 hours
Dimensions
Weight
Operating Temp.
Generation 2+ (D-221)
3 US (D-321)
28 to 38 lp/mm (D-221),
45 to 64 lp/mm (D-321)
15˚
860’
262 m
10’ to infinity
3 m to infinity
902’ (D-221) / 1230’ (D-321)
275 m (D-221) / 375 m (D-321)
656’ (D-221) / 984’ (D-321)
200 m (D-221) / 300 m (D-321)
6.9”x4.4”x2.2”
177mm x 112mm x 55mm
2 lbs
907 grams
-4° F to 113° F
-20°Cto+45°C
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GENERAL VIEW AND DESCRIPTION OF D-221/321
The D-221G/321G is the only system on the
market based on high performance Generation
Figure 1
II+ or III technology that offers true stereo vision
with enhanced depth perception. This lightweight system features fully adjustable headgear, built-in IR, Automatic Brightness Control,
and Bright Source Protection. The unique, wide
exit pupil design eliminates the need for interpupillary adjustment. Redundancy of electronically
independent image tubes provides increased
reliability in critical situation. With an optional 3x
lens kit, D-121B/321B offers the ultimate versatility in a dual-tube system.
1. Body
2. Eyepiece
3. Diopter Adj.
4. Front Lens
5. Focusing Ring
6. IR Illuminator
7. ON/OFF Switch
8. Decorative Cover
9. Battery Compartment
10. Lens Cover
Operation
Please make sure that the lens covers are on before switching the D-221/321 on in high light conditions.
1. Battery Installation
The D-221/321 has common body (1) (fig. 1), which contains two image intensifiers and the battery
compartment. The lenses (4) (fig. 1) and the eyepiece assemblies (2) (fig. 1) are joined by threaded
connections.
To insert batteries:
5
6
2. Controls
The D-221/321 has one three-way rotary switch (7) (fig. 1). To switch on the unit, turn switch (7)
clockwise to the first position. If you want to switch on the IR illuminator, turn switch to the next position.
3. Lens Replacement (optional)
Follow the same procedure to replace 80mm f1.6 lenses with 26mm f1.4 lenses.
4. Head Mount Attachment (D-221G/321G standard, D-221B-321B optional)
To attach the D-
221/321 to the Head
Mount:
1. Remove the decora-
tive cover.
2. Turn screw (1) (fig.
2) counter clockwise
until it stops.
3. Press button (2) (fig.
2); insert the mounting adapter into the
slot and release
button.
4. Move the D-221/321
along the sledge to
the most comfortable
position and tighten
screw (1).
5. Adjust head strap for
maximum comfort.
6. To flip-up, press the
rotation enable button (fig. 2) and move
the D-221/321 to the
top position.
7
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NIGHT VISION
CHARACTERISTICS
Monochromatic Image
Night Vision Devices produce a monochromatic
image. You will not be able to see any differentiation between colors. In particular, red and
green lights will both appear green. Take care to
verify color differences with unaided vision. Exercise extreme caution when operating aircraft,
ground vehicles, or marine vessels while using
night vision equipment.
Color Sensitivity
Night Vision Devices are more responsive to
red and white lights than green and blue lights.
Because of this, distant red and white lights may
appear closer than green or blue lights. Exercise extreme caution when using these lights for
navigation. Periodically verify the distances to
these lights with your unaided eyes.
Extreme Darkness
Night Vision Devices are effective under most
dark conditions including overcast starlight.
They are not practical in an extremely dark en-
vironment such as in a tunnel where there is no
natural ambient light. Without sufficient ambient
light, the operator may notice pinpoint-size spar
kles (scintillation or noise) in the image area.
These sparkles are small amounts of energy
generated inside the image intensifier that strike
the phosphor screen and are an indication that
the device is working.
Contrast Reversal
Night Vision Devices detect light that cannot
be seen by the human eye. This light is often
referred to as being in the near-infrared light
spectrum. The existence of this light and the
manner in which it reflects is not normally visible
to the naked eye. For this reason, objects that
normally appear lighter than their surroundings
may appear dark against a light background. In
addition, the output image of the Night Vision
Device is dependent on the reflective quality
of the objects the operator sees in the viewing
area. Objects that appear light during the day
but have a dull surface may appear duller when
viewed through a Night Vision Device. All of
these factors must be taken into account when
utilizing a Night Vision Device for observation or
navigation purposes.
-
Depth Perception
Night Vision does not present normal depth
perception. Use extreme caution when using a
Night Vision Device where reliance upon depth
perception is important.
Fog and Rain
Night Vision Devices are very responsive to
reflected ambient light; therefore, fog or heavy
rain can reflect too much light toward the Night
Vision Device and may seriously degrade its
performance.
Honeycomb
This is a faint hexagonal pattern throughout
the image area. This effect is more noticeable
under high light conditions. Do not be concerned
- the honeycomb effect is an inherent character-
istic of all high-amplification night vision systems
that incorporate a microchannel plate in the
intensifier.
Black Spots
or reliability of a night vision device and a number of sizes are inherent in the manufacturing
process.
Image Intensifier Life
Night Vision Devices are designed to be robust.
The image intensifier tube, however, does not
have an unlimited lifetime. The life of the image
intensifier is dependent upon the amount of
use. Under normal operating conditions, it will
provide reliable performance for an extended
period of time.
MAINTENANCE
Optics
Always clean the optics with a suitable optical
cleaning cloth. Do not use detergents or excessive moisture to clean any part of the Night Vision Device.
Battery/Battery Compartment
Any Night Vision Device that is to be stored for a
long or undetermined amount of time must have
the batteries removed.
These are cosmetic blemishes in the image
intensifier. They do not affect the performance
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Moisture
The Night Vision Device is water resistant. No
warranties or guarantees apply to a Night Vision
Device that has been submerged in water. Take
great care when using any night vision in a wet
environment as the image intensifier tube is
sensitive to moisture.
Salt Water
If the Night Vision Device is exposed to a salt
water environment, wipe it off with a clean cloth
slightly dampened with fresh water and dry it
thoroughly. Take special care of the optics as
noted above.
Sunlight
Night Vision is sensitive to light and must be
stored away from direct contact with bright light
sources of any kind.
!WARNING!
Improper care or unauthorized
maintenance can damage device
and may result in warranty nullifi-
cation.
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TROUBLESHOOTING
Symptom Probable Cause Corrective Action
No visible Image a. Objective lens cap not been removed.
Image flickers, flashes, or
clicking is heard
Dark spots on screen a. Cosmetic blemishes. Normal for this
Image not clear a. Focus is not adjusted.
Fixed pattern noise.
(honeycomb)
Pattern of dark thin lines
(chicken wire)
Image dimmer than
usual.
b. Battery cover is loose.
c. Incorrect battery polarity
d. Weak battery
a. Normal for new battery to cause this for
first five minutes.
technology.
b. Too close to object
a. Cosmetic blemishes caused by too mach
illumination.
a. Normal under worst conditions. These
lines will form hexagonal or square waveshaved lines.
a. Weak batteries
b. Low natural illumination level.
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a. Remove cap
b. Tighten cover
c. Re-insert battery
d. Replace battery
a. If condition continues contact manufacturer for service
instructions
a. Acceptable as long as it does not interfere with operation of the device
a. Adjust focus
b. Increase viewing distance.
a. Acceptable as long as target resolution can be resolved.
a. Acceptable as long as it does not interfere with operation of the device
a. Replace the batteries.
b. Turn on IR illuminator.
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WARRANTY
The D-221/321 is covered by a limited 2 year
warranty from time of sale. The warranty is valid
only for the original purchaser.
The manufacturer warrants its products to be
free from defects in material and workmanship during the warranty period. If the product
proves to be defective during this period, the
manufacturer will repair the original product or
replace it with a like product at the sole discretion of the manufacturer.
This limited warranty does not cover:
1. Any product on which the serial number has been
defaced, modified, or removed.
2. Any product that has experienced deterioration or
a malfunction from: accidents, misuse, neglect, fire,
water, lighting or other acts of nature, unauthorized
product modification or failure to follow instructions
supplied with the product, repair or attempted repair
by anyone not authorized to do so, use of supplies
or parts not meeting manufacturer’s specifications,
normal wear and tear, and/or extreme wear and
tear caused by battlefield conditions or other extreme environments.
Customer is hereby notified that operation of this
device during daylight hours or under excessive
light conditions may permanently damage in
ternal components and said damage will not be
covered under this warranty.
No other warranties, expressed or implied, are
valid without an agreement in writing provided
by the manufacturer.
All shipping involved in warranty work/replacement is the sole responsibility of the purchaser.
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LIMITATIONS OF LIABILITY
Night Optics USA, Inc. will not be liable for
any claims, actions, suits, proceedings, costs,
expenses, damages or liabilities arising out of
the use of this product. Operation and use of
this product are the sole responsibility of the
Customer. Night Optics USA, Inc.’s sole responsibility is limited to providing the products
and service outlined herein in accordance with
the terms and conditions of this Agreement.
The provision of products sold and services
performed by Night Optics USA, Inc. to the
Customer shall not be interpreted, construed, or
regarded, either expressly or implied, as being
for the benefit or creating any obligation toward
any third party of legal entity outside Night Optics USA, Inc. and Customer; Night Optics USA,
Inc.’s obligations under this Agreement extend
solely to the Customer. Night Optics USA, Inc.’s
liability hereunder for damages, regardless of
the form or action, shall not exceed the fees or
other charges paid to Night Optics USA, Inc. by
the Customer or the Customer’s dealer. Night
Optics USA, Inc. shall not, in any event, be
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liable for special, indirect, incidental, or conse
quential damages, including, but not limited to,
lost income, lost revenue, or lost profit, whether
such damages were foreseeable or not at the
time of purchase, and whether or not such damages arise out of breach of warranty, a breach
of agreement, negligence, strict liability, or any
other theory of liability.
ACCEPTANCE CERTIFICATE
Night Vision Goggle/Binocular D-221/321 conforms to manufacturer’s specifications.
Serial # ___________________
Date of Sale ___________________
Signature: ___________________
NIGHT OPTICS USA, INC.
5122 Bolsa Ave. Suite 101 Tel: (714) 899-4475
Huntington Beach, CA 92649 Fax:(714) 899-4485
USA www.nightoptics.com
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