Dual Tube Night Vision Goggle/Binocular
D-221 / 321
User’s guide
Night Optics USA, Inc.
2
!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 light-
sensitive 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 pro-
tective cover.
This Night Vision Device is
equipped with a built-in IR illumina-
tor 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 dif-
ference between colored lights. It
produces only a green viewing im-
age. When color differentiation is
needed, verification with unaided
eyes is recommended.
All Image Intensified Devices re-
quire some light to operate such
as moonlight or ambient starlight.
Night vision devices will not pen-
etrate smoke, fog, rain, or heavy
snowfall. Cloud cover and tree
shadows will reduce the effective-
ness 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, re-
charge, or expose the battery to
fire or high temperature. Doing so
may result in an explosion and re-
sulting chemical burns. When the
device is not in operation for a pro-
longed period, remove the battery
from the device and keep it sepa-
rately in a cool and dry place.
3
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.
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TECHNICAL SPECIFICATIONS
D-221G/321G (goggle configuration)
Image Intensifier
Generation 2+ (D-221)
3 US (D-321)
Resolution
28 to 38 lp/mm (D-221),
45 to 64 lp/mm (D-321)
Magnification 1x (3x optional)
Lens System 26mm f1.2
FOV
@1000 yards
@1000 m
40˚
2099’
640 m
Range of Focus
10” to infinity
25 cm to infinity
Detection Range
738’ (D-221)/1066’ (D-321)
225 m (D-221) /325 m (D-321)
Recognition Range
492’ (D-221)/902’ (D-321)
150 m (D-221) /275 m (D-321)
Diopter Adjustment +4 to -4
Weather Resistant Yes
Camera Adaptable No
IR Illuminator Yes
Battery Type/Life CR123/30 hours
Dimensions
4”x5.8”x2”
109mm x 149mm x 55mm
Weight 21 oz / 600 grams
Operating Temp.
-4° F to 113° F
-20°C to +45°C
D-221B/321B (binocular configuration)
Image Intensifier
Generation 2+ (D-221)
3 US (D-321)
Resolution
28 to 38 lp/mm (D-221),
45 to 64 lp/mm (D-321)
Magnification 3.2x (1x optional)
Lens System 80 mm f1.6
FOV
@1000 yards
@1000 meters
15˚
860’
262 m
Range of Focus
10’ to infinity
3 m to infinity
Detection Range
902’ (D-221) / 1230’ (D-321)
275 m (D-221) / 375 m (D-321)
Recognition Range
656’ (D-221) / 984’ (D-321)
200 m (D-221) / 300 m (D-321)
Diopter Adjustment +4 to -4
Weather Resistant Yes
Camera Adaptable No
IR Illuminator Yes
Battery Type/Life CR123/30 hours
Dimensions
6.9”x4.4”x2.2”
177mm x 112mm x 55mm
Weight
2 lbs
907 grams
Operating Temp.
-4° F to 113° F
-20°Cto+45°C
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