National Geographic Binoculars User Manual

Binoculars
Owner’s Manual
Congratulations on your purchase of a pair of precision-crafted National Geographic™
binoculars.
Please take a few moments to familiarize yourself with the contents of this manual. By following
a few simple procedures and providing minimal care, you will find that your new binoculars will
give you many years of superb viewing.
Parts of your binocular:
ROOF PRISM BINOCULAR PORRO PRISM BINOCULAR
FOCUSING
WHEEL ‘A’
DIOPTER ADJUSTMENT
EYEPIECES
FOCUSING
WHEEL ‘B’
TRIPOD SOCKET
OBJECTIVE LENSES
Attaching the neck cord or neck strap:
National Geographic compact binoculars come with soft, woven nylon neck cords. These straps
have a metal clip at each end. Attach these clips to the mounting points located on each lens
barrel.
Other National Geographic binoculars feature a flat
nylon strap with a friction-fit clip near each end. Pull
up on the strap to create a loop as it passes
through a friction-fit clip. Pass one free end of the
nylon strap through one of the mounting points
located on the underside of the binoculars near the
eyepieces. Bring the free end of the

National Geographic Binoculars Specifications

General

Magnification	8x
Objective Lens Diameter	42mm
Prism Type	BaK-4
Waterproof	Yes
Fogproof	Yes
Lens Coating	Fully Multi-Coated
Field of View	129m/1000m
Weight	640g
Dimensions	145x125x53mm

Summary

Parts of your binocular

Attaching the neck cord or neck strap

How to use your binoculars

Interpupillary distance

Adjusts binocular barrels to match distance between eyes for a single image.

Focusing

Explains how to adjust center focus wheel or individual eyepieces for sharp images.

Diopter Adjustment

Compensates for differences in vision between the left and right eyes.

Binocular features

Fold-down rubber eyecups

Soft rubber eyecups protect lenses and reduce distracting light, can be folded.

Optical lens multi-coatings

Lenses treated with coatings to filter rays, increase light transmission, and enhance contrast.

Long-eye relief

Eyepieces allow viewing without pressing them tightly against eyes, convenient for glasses.

Rubber body armor

Rubber coating protects against bumps and scrapes, providing a non-slip grip.

Waterproof and fog-resistant binoculars

Tripod adapter

Zoom

Optical Magnification

Linear and Area Magnification Compared

Compares linear magnification (width) to area magnification (how many times an area fits).