Vortex Viper 8x28 R/T, Viper R/T User Manual

1

The 28mm Viper R/T
binocular is equipped with
the Vortex R/T Ranging
reticle, designed to assist the
user in calculating distances.

Binocular Adjustments . . . . . . . . . . . . . . . 3

Using the Viper R/T Reticle . . . . . . . . . . . . 6

Caring for the Lenses . . . . . . . . . . . . . . . . 11

Accessories . . . . . . . . . . . . . . . . . . . . . . . . 12

Vortex Service and Repair Policy . . . . . . . 14

With a tough and durable roof prism design and brilliant
optics, the Viper R/T
can be relied on in the
worst conditions thanks to
Vortex’s premium XD glass
and XR lens coatings.

®

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The Viper R/T binocular features fully multi-coated
optics and phase-corrected prisms for the ultimate in light
transmission and brightness in any light condition.

Optical Quality

Rugged Design

The 28mm Viper R/T binocular has a rugged roof prism
design. An internal focus mechanism, o-rings at all open
points, and argon purging contribute to the waterproof,
dust proof, internally fogproof design of this binocular.

Center Focus

Diopter Ring

Roof Prism
Housing

Objective
Lenses

Neckstrap
Attachment
Point

Adjustable Winged
Eyecup

Reticle Focus

With eyeglasses or sunglasses,
roll down the eyecups.

Without eyeglasses or sunglasses,
keep the eyecups fully extended.

Adjusting the Eyecups

Adjusting the Interpupillary Distance

The interpupillary distance
(IPD) is the distance between the
centers of the left and right eye
pupils. Match the IPD of your
eyes to that of the binocular by
rotating the binocular barrels
inward or outward until you
see a single image that is free of
shading.

IPD

Adjust the IPD for a custom

fit and better views.

Binocular Adjustments

The Viper R/T binocular feature winged eyecups that block
out stray light and rotate for a custom fit. These eyecups
roll up and down so any viewer can take advantage of the
long eye relief and enjoy comfortable, full-field viewing
even when wearing eyeglasses or sunglasses.

45

Focusing the Binocular

Choose an object that is about 20 yards away from you
and follow this two-step process to properly adjust the
focus. Be sure to stay in the same spot until you have
adjusted both the center focus and diopter.

1. Adjust the center focus

Start by closing your right eye or
covering the right objective lens with
your hand. Adjust the center focus
wheel until the image is in focus.
Leave the center focus in this position
as you adjust the diopter.

2. Adjust the diopter

Start by closing your left eye or covering the left objective

lens with your hand. Look through your right eye and

adjust the diopter until the object

is in focus. Make note of this

diopter setting in case you need

to set it again.

From this point on, you will
only need to use the center
focus dial.

The reticle focus is located on the left ocular as you hold
the binocular. This focus is used to adjust the reticle image
until it is clear and sharp. Focusing the reticle is easiest
when closing the right eye while setting this focus. When
looking at a white wall or the sky, adjust the reticle focus
until the reticle
image is clear
and sharp.
Once set for a
particular user,
the reticle
focus can be
left in place.

Adjusting the Reticle Focus

Reticle Focus

Diopter

Binoculars are not intended for looking at the sun, or any other intense light

source. Such viewing could damage the retina and cornea of your eyes—even

to the point of causing blindness.

Caution