Vortex Optics VIPER XBR 2.5-10X44 CROSSBOW SCOPE User Manual

The VorTex® Viper® xBr™ CrossBow sCope

The Vortex®Viper®XBR™ crossbow scope is intended for extended
range crossbow shooting. With the XBR, you have the unique ability
to choose between using the elevation turret or the reticle when
compensating for arrow drop on long shots.

Dual Use: Shooting Tactical / Hunting

US P a t e n t 7,9 37, 8 7 9

Fast Focus Eyepiece

Reticle Focus

Magnification
Adjustment Ring

Illumination
Adjustment Dial

MagView

Winda ge
Adjustment Dial

Elevation
Adjustment Dial

Objective
Lens

— Please read entire manual before using your new optic.

3 2

reTiCle opTions

The Focal Plane

All scope reticles can be termed either first focal plane (FFP) or
second focal plane (SFP) according to the internal location of the
reticle within the scope. This model features a second focal plane
reticle design.

Second Focal Plane Reticles

Second focal plane reticles are located near the eyepiece behind the
image erecting and magnifying lenses. This style of reticle does not
visually change in size when you change the magnification. The
advantage of an SFP reticle is that it always maintains the same ideal
visual appearance.

Important Note: The marked Viper XBR 2.5-10x44 crossbow scope
reticle subtensions used for arrow drop and wind drift compensation
are correct at a magnification of 10x.

CrossBow sCope AdjusTmenTs

Reticle Focus

The Viper XBR crossbow scope features a fast focus eyepiece designed to
quickly and easily adjust the reticle focus.

To adjust the reticle focus:

1. Look through the scope at a
blank white wall or up at the sky.

2. Turn the eyepiece focus knob in
or out until the reticle image is as
crisp as possible.

TIP: Try to make this particular
adjustment quickly as your eye will
try to compensate for an out-of-focus
reticle.

Once this adjustment is complete, it will not be necessary to re-focus
every time you use the crossbow scope. However, because your eyesight
may change over time, you should re-check this adjustment periodically.

Warning

Looking directly at the sun through a crossbow scope, or any optical
instrument, can cause severe and permanent damage to your eyesight.

Adjust the Reticle Focus

5 4

Windage and Elevation Adjustments

The Viper XBR scope features precision finger-adjustable elevation and
windage dials with audible clicks.

To make adjustments:

1. Following the directional pointer
on the turret cap, turn the dial in
the direction you wish the arrow’s
point-of-impact to go: up or down, left
or right.

2. Replace the outer cover on the
windage turret when done.

TIP: After sight-in, you can re-align
the zero marks on the windage turret
dial with the reference dots if you wish (see Indexing the Windage Dial with
Zero Reset on page 18).

Elevation Dial

Windage Dial

MOA Adjustments

The Viper XBR crossbow scope uses finger adjustable elevation and
windage turrets with scales measured in minutes of angle (MOA).
MOAs are a unit of angular measurement which approximately
equals one inch at 100 yards.

• The tactical-style elevation turret design provides a high
travel range along with rapid adjustment ability. Each click of the
elevation turret will provide

1 MOA of reticle movement.

• The windage turret features a standard design with an external
cap. Each click of the windage turret will provide

1 MOA of

reticle movement.

MOA at Common Distances

Remember that one click of the turret equals 1 MOA .

1 MOA =

1 inch at 100 yard s

1/2 inch at 50 y ard s

1/3 inch at 33 y ard s

1/4 inch at 25 ya rds

1/5 in ch at 20 yard s

7 6

Turret Rotation

Vortex’s patented Radius Bar visually assists keeping track of turret
rotations and provides a quick visual reference that allows you to
confirm:

Radius Bar

• Dial orientation is correct and has
not shifted as a result of accidental
contact.

• Dial orientation is at the zero point
when using the CRS feature (see page

10).

TIP: By watching the position of the
bar while making elevation adjustments,
you are able to quickly track full, half, and quarter rotations.

To get these benefits from the Radius Bar, the “0” mark on the turret
must be indexed with the zero reference line on turret post (see
Setting the CRS Stop and Indexing Elevation Knob on page 17).

Variable Power Adjustments

To change the magnification, turn the magnification ring to the desired
level. The MagView fiber optic magnification indicator provides a low
light reference for magnification level. A small tactile indent at the 5x
magnification setting allows you to quickly select 5x.

Illumination Adjustments

The Viper XBR scope features

Batter y Cap

a reticle illumination system
with variable levels of intensity
to aid in low light performance.

To activate the illumination,
rotate the adjustment dial
in either direction. This

Illumination
Adjustment
Dial

illumination dial allows for 10
levels of brightness intensity; an off click between each level allows you
to turn the illumination off and return to a favored intensity level with
just one click.

Replacing the Battery

1. Unscrew the outer cap with a coin.

2. Remove the battery.

3. Replace with a new CR 2032 battery.

4. Re-install the outer battery cap and be sure to fully tighten it.

Magnification
Adjustment

Ring

MagView

Indicator

9 8