Bushnell 78-8845 Manuel d'utilisateur télécharger pdf (Page 8)

NIGHT VISION

BUSHNELL 2003 CATALOG

VIEWING FIELD-OF-VIEW

MAGNIFICATION RANGE (ft.@100yds / INFRARED BATTERY SIZE WEIGHT TRIPOD

MODEL x OBJ. LENS (ft. / m) m@100m) ILLUMINATOR TYPE (in. / mm) (oz. / g) MOUNT

26-0400 2.5 x 42 4–600 / 1.2–183 94 / 31 Yes (Built-In) AA (2) 6.5x 6.3x 3.0 / 165x 160 x 76 28 / 794 Yes

26-4366 4.3 x 66 16–450 / 4.9–137 52 / 17 Yes (Attachable) AA (2) 8.6x 3.9x 2.9 / 218x 99x 74 45 / 1270 No

26-3150 3.1 x 50 1.5–400 / .5–122 79 / 26 Yes (Built-In) CR123A (1) 7.9x 6.45x 2.7 / 201x 164x 69 40 / 1134 Yes

26-1020 1 x 20 .5–100 / .2–30 210 / 70 Yes (Built-In) N (2) 5.25x 2.25x 4.25 / 133x 57 x 108 18 / 510 No

NIGHT VISION

2.5 x 42mm

These full-featured night vision binoculars are

exceptionally comfortable to use during long

periods of observation and viewing. Light weight,

extra-long viewing range and a wide field-of-

view makes them ideal for law enforcement,

night navigation and wildlife surveillance.

26-0400

Style: Gen 1 Binocular

4.3 x 66mm

Super performance at longer ranges, this

is a higher power monocular with an extra

large objective lens, adjustable infrared

illuminator and a special aperture control

setting to increase or decrease the amount

of light which reaches the image intensifier.

26-4366

Style: Gen 1 Monocular

3.1 x 50mm

These night vision binoculars feature

higher magnification and extra-large

objective lenses. With a tripod mount

and IDP adjustment, they’re ideal for

prolonged viewing at longer ranges.

26-3150

Style: Gen 1 Binocular

1x 20mm

Versatile goggle with headgear

that can also be detached for

use as a binocular.

26-1020

Style: Gen 1 Goggle

with Headgear

NIGHT VISIONTERMINOLOGY

An optical device comprised of high-quality image intensifier tubes and optics that

amplify existing light to allow you to see in conditions too dark for the naked eye.

Infrared (I.R.) Illuminator

Provides a light source for the system to amplify, yielding

enhanced images in very low light conditions such as caves

where no ambient light is available for amplification.

Built-In Dual-Beam Infrared Illuminators

Allows you to adjust the I.R. from low to high power according

to your needs – high beam for pin-point illumination, and low

beam for wide-angle illumination.

Objective Lens

Collects all available light and focuses it on the image

intensifier. It also provides image magnification. The best

objective lenses have low magnification (5x or less), are high-

speed (f2 or faster) and are coated for maximum efficiency in

the near-infrared bandwidth.

Phosphor Screen

Positioned at the back of the intensifier tube, the

green phosphor screen renders a visible night

vision image. The human eye is most sensitive

to green contrasts.

Photocathode

Converts light (photon energy) into electrons

(electrical energy) which are then amplified in

the intensifier. The objective lens focuses available

light on the photo-electric surface of the photocathode which

is excited and passes electrons within the tube.

Resolution

A measure of the ability to render and display a detailed

image. Image intensifier resolution remains constant and is

expressed as the maximum number of line pairs per millime-

ter (lp/mm) that can be discerned when a black-and-white

stripe pattern is focused on the photocathode.

Types of Bushnell



Night Vision

Generation 1

Does not require an active infrared light source. Instead it

amplifies available ambient light.

Advanced Night Vision

Utilizes fiber optic bundles to eliminate distortion and

noise resulting in a high-resolution, high-contrast premium

image. Superior contrast allows you to see dark subjects

against darker backgrounds. Lower distortion renders a

flatter, less rounded image with crisper details.

Night Vision Monocular

A Night Vision device for use with one eye.

Audio Monocular

Features direct sound amplification technology.

Headphones, boom microphone and recording port included.

Night Vision Binocular

Two complete sets of optics and image intensifiers that are

connected and share a common power supply.

Angle or Field-of-View

The measure of the angle defining the field visible through

the Night Vision system at a distance of 100 yards.

Bright Source or Over-Light Protection

An electronic circuit that turns the power to the Night Vision

device down or off when it is exposed to bright light (such as

automobile headlights). This protects the image intensifier

and extends its life. The device will recover and resume nor-

mal operation in 1–2 minutes.

Eyepiece Focus

Used to match your Night Vision scope or binocular to your

specific eyesight.

Image Intensifier or Intensifier Tube

The active component in a Night Vision System that amplifies

light and presents a usable image.

How Does It Work?

1. Available light (energy) is collected by the objective lens and

focused on the image intensifier.

2. Inside the intensifier a photocathode is “excited” by the light and

converts the energy into electrons.

3. The electrons accelerate across an electrostatic field inside

the intensifier and strike a phosphor screen (like a monochrome

TV screen) which emits an image that you can see. This acceleration

of electrons provides gain and enhances the image.

1. Image intensifier tube 3. Objective lens

2. Phosphor screen 4. Infrared illuminator

1 2 3 4 5 6 7 8

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Bushnell 78-8845 Manuel d'utilisateur Page 8

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