Nikon IRT 4-12X42 User Manual

Nikon Laser IRT 4-12X42

Instruction Manual

Congratulations on your choice of a Nikon Laser IRT. Your new scope is the finest
example of Nikon’s rugged and durable construction and precision bright optics;
important qualities for a serious shooter’s riflescope.
Whether you use your scope for hunting or for target shooting, the procedure for
mounting is identical. After mounting the scope on your riflescope, follow the
procedures for reticle alignment.

When setting the reticle for hunting, you should determine your standard range and
then adjust the reticle based upon that reading distance. For targets which vary
from that standard distance you may simply adjust the position of the reticle in
relation to your target, or you may wish to use the procedure for trajectory
compensation. It’s up to your personal preference.

We hope that you will enjoy your new Nikon Laser IRT for many years to come.
Enjoy using it, and above all, always follow safe shooting procedures!

Please observe the following guidelines strictly so you can use the equipment
properly and avoid potentially hazardous problems. Before using this product, read
thoroughly the “SAFETY PRECAUTIONS” and instructions on correct usage
accompanying the product. Use of controls or adjustments or performance of
procedures other than those specified herein may result in hazardous radiation
exposure.

Keep this manual within reach for easy reference.

• Specifications and design are subject to change without notice.

• No reproduction in any form of this manual, in whole or in part (except for

brief quotation in critical articles or reviews), may be made without written
authorization from NIKON VISION CO., LTD.

The product(s) described herein may be subject to export control regulations in the
relevant country(ies). It (they) should not be exported without authorization of the
exporting governmental authority if the regulations apply.

Key Features

• Measuring range: 33 yards-766 yards

• Distance measurement display: 1 yard

• Easy-to-aim 4-12x optical observation system

• Waterproof design (NOT designed for underwater usage)

• Invisible/Eyesafe FDA Class I Laser

• 8-second results display

• Compact, ergonomic design

• Stand-by mode (after approx. 8 sec. Unattended)

• Automatic shut-off (after approx. 2 hours. Unattended)

• Default to “Last Use” settings

• 12-second continuous measuring function

• Diopter adjustment function

• Infrared/manual control distance measurement system

The Nikon Laser IRT emits invisible, eyesafe, infrared energy pulses that reflect off
the selected target back to its optical receiver. Sophisticated precision charge
circuitry is used to instantaneously calculate distances, by measuring the time it
takes for each pulse to travel from the rangefinder to the target and back. The
maximum range of the instrument depends on the reflectivity of the target, its color,
surface finish, size and shape.

The following factors ensure best range and accuracy:

• Nighttime use

• Cloudy weather

• Bright-colored targets

• Targets with highly reflective surfaces

• Targets with shiny exteriors

• Large-size targets

• Shooting targets facing at 90 degrees

Measurement may result in inaccuracy or failure in the following cases:

• Slender or small target

• Target has diffusing reflective surface

• Target does not reflect the laser beam (glass, a mirror, etc.)

• Black target

• Target has pronounced depth

• In snow, rain or fog

• Target measured through glass

• Reflective surface measured from diagonal direction

• Moving target

• Obstacle moving in front of the target

• When targeting the surface of water

Status of the Internal Display

Changing Battery

• Type of battery

Scope – 3V CR2 Lithium Battery
Remote control unit – 3V CR2025 Lithium Battery

• Battery change
Scope

1. Loosen the Battery Chamber Lid screw with coin. (Fig. 5)

2. Replace the CR2 Lithium Battery correctly. (Fig. 6)

3. Tighten the lid screw firmly for air tightness

Remote control unit

1. Insert the metal plate into the groove of opposite side of LED. (Fig. 7)

2. Press down the metal plate (a) to lift up the rear cover (b). (Fig. 7) There are eight
hinge stoppers. (Fig. 8) (Be careful to break the hinge stopper.)

3. Replace the CR2025 Lithium Battery correctly. (Fig. 8)

4. Put the rear cover back and press the edge of cover to catch the hinge stopper.

Battery condition
Scope

Y flashing: Battery charge is low and battery should be replaced.

Remote control unit

No information

Install the Remote control unit

1. The Remote control unit is attached near the thumb of the hand which is holding the
gun.

2. The LED on the Remote control unit must turn the direction of the Remote control
Detector. (Fig. 2 & 3)

3. Then fix the Remote control Unit with the band.

Effective control range is less than 20 inches.

Operational Summary
Riflescope

1. Diopter adjustment

(1) Look through the eyepiece with your eye positioned about 4 inches away from
the eyepiece lens (Fig. 9), and you will see the Nikoplex reticle (Fig. 10), or the BDC
reticle (Fig. 11).