540501

Vortex Diamondback Riflescope Manual

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Magnification
Ring
To change the power, turn the magnification ring to the desired
level. Use lower powers (offering a
wider field of view) when you may
need to make a quick shot at closer
distances.
3. Variable Magnification Adjustments
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 an apparent movement of the target in
relation to the reticle which can cause a small shift in the point of
aim. Parallax causes the greatest problem on small targets at high
magnification as with varmint and target shooting.
4. Parallax Adjustments
Some Diamondback riflescopes have an adjustable objective (AO)
lens. Most other models are set at the factory to be parallax-free at
100 yards; this is a setting that will work well for the majority of
shooting situations encountered in the field. A few models will be
parallax-free at 50 yards.
When shooting at distances other than 100 yards, simply pay attention to
good shooting form, keeping your eye centered in the scope, and you will
minimize any problems with parallax.
Adjustable Objective
Setting the adjustable objective lens
on the AO models is very easy.
Adjustable Objective Lens
A. Be sure that the reticle is properly
focused (see page 6).
B. Match the range number
on the objective lens barrel
(distance you are shooting) as closely as possible to the indicator
arrow on the riflescope body.
C. Check the setting by moving your head up/down and left/right
while looking through the scope. The setting is correct if there
is no apparent movement between the reticle and target. If
there is movement, continue adjusting the lens slightly until
the movement is eliminated.
Riflescope Installation
To get the best results from your Diamondback riflescope, proper mounting is essential. Although not extremely difficult, the correct steps must
be followed. If you are unsure of your abilities, it would be best to use the services of a qualified gunsmith.
Your Diamondback riflescope is pre-set at the factory with the
reticle centered in both adjustment ranges. This is the ideal
position to begin sight-in. If you have changed the settings and
wish to re-center the reticle, follow this procedure:
1. Centering the Reticle
A. Turn either dial (windage or elevation) as far as you can in
one direction until it stops.
B. Turn the dial in the other direction until it stops, carefully
counting the audible clicks as you turn the dial.
C. Turn the dial back again to half the number of clicks counted
in Step B—the reticle will be centered for that adjustment only.
D. Repeat for the other adjustment so that the reticle is centered
in both the windage and elevation settings.
Using high quality, appropriately sized rings* and bases matched
to your rifle, mount the scope as low as possible on the rifle. A
low mounting will help assure proper cheek weld and aid in a
solid shooting position and fast target acquisition. We recommend
using the lowest rings that will give complete clearance of scope
and rifle. Avoid contact with barrel, receiver, bolt handle, or any
other part of the rifle. Work the riflescope’s zoom ring and rifle’s
action to assure no contact. Be sure to follow the manufacturer
instructions supplied with the rings and mounting base.
2. Mount As Low as Possible
*Standard Diamondback models use 1-inch rings.
3. Adjust for Maximum Eye Relief
Before the final tightening of the scope rings, adjust for maximum
eye relief in order to avoid injury from recoil.
A. With the riflescope set at the lowest magnification, slide
the scope as far forward as possible in the rings.
B. While viewing through the scope in the normal shooting position,
slowly slide the scope back towards you. When you feel you
just hit
the full field of view, stop. Without disturbing the front-back
setting, slowly rotate the scope until the elevation dial is at the top
of the scope and the vertical crosshair of the reticle matches the
vertical axis of the rifle. Using a visual vertical reference such as the
edge of a building or telephone pole can help with this.
C. Tighten the rings per the manufacturer’s instructions.
Initial bore sighting of the scope at short range of 50 yards will
save time and money at the shooting range. This can be done using
a bore sighter, following the manufacturer’s instructions, or by
removing the bolt and sighting through the barrel on a bolt action
rifle. With the rifle placed solidly on a bench and the bolt removed,
sight through the bore and center the target inside the the barrel.
With the bulls-eye centered in the bore, make windage and elevation
adjustments until the reticle crosshair is also centered over the bulls-
eye. If possible, make initial windage adjustments using the mounting
base rather than the riflescope’s windage dial.
4. Bore Sighting
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