Vortex Optics VIPER HS LR 2.5-10X32 RIFLESCOPE — First Focal Plane - Manual (Page 4)

HS LR
RIFLESCOPE
7 6
This Viper riflescope uses a side focus adjustment which provides maximum
image sharpness and eliminates parallax error.
Using the Side Focus
1. Be sure the reticle is correctly focused (see Reticle Focus on page 5).
2. Turn the side focus knob until the
target image is as sharp as possible. The
yardage numbers referenced on knob
should closely match the actual yardage
to the target.
3. Check for parallax error by moving
your head back and forth while looking
through the scope. The focus is correct if
there is no apparent shift of the reticle on the target. If you notice any
shift, adjust the focus knob slightly until all shift is eliminated.
Setting the side focus:
Parallax is a phenomenon that results when the target image
does not quite fall on the same optical plane as the reticle
within the scope. When the shooter’s eye is not precisely
centered in the eyepiece, there can be apparent movement of
the target in relation to the reticle, which can cause a small
shift in the point of aim. Parallax error is most problematic
for precision shooters using high magnification.
The Viper HS LR riflescope incorporates adjustable elevation and windage
dials with audible clicks. Each audible click moves the bullet’s point-of-
impact 1/4 of a minute of angle (MOA).
1/4 MOA closely corresponds to 1/4 inch at 100 yards, 1/2 inch at 200
yards, 3/4 inch at 300 yards—taking four (4) clicks to move the bullet’s
point-of-impact approximately one inch at 100 yards.
Windage and Elevation Adjustments
Note: After sight-in, you can re-align the zero marks on the turret knobs
with the reference dots if you wish (see Indexing Adjustment Dials with
Zero Reset on page 12). Replace outer covers when done.
1. Remove the outer covers.
2. Turn the turret in the appropriate
direction: Up/Down or Left/Right as
indicated by the arrows.
3. Following the directional arrows, turn
the knobs in the direction you wish the
bullet’s point-of-impact to go to.
To make adjustments:
Variable Power Adjustments
To change the magnification,
turn the magnification ring to the
desired level. The Vortex fiber
optic magnification indicator will
provide a low light reference for
magnification level.
Magnification
Scale
MagView
Indicator
Elevation Knob
Windage Knob
Adjust the side focus knob