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Vortex VIPER HS-T Riflescope Manual

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HS-T
RIFLESCOPE
The Viper HS-T riflescope features a side focus knob which should be used
to fine-tune the image focus. When the
image is sharply focused, parallax error
will also be eliminated.
Image Focus and Parallax Correction
1. Be sure the reticle is correctly
focused (see Reticle Focus section 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.
Using 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. This can cause an apparent movement of the reticle
in relation to the target if the shooter’s eye is off-centered.
Correctly focusing the target image will allow it to fall on the
same optical plane as the reticle within the riflescope.
The Viper HS-T riflescope incorporates precision finger adjustable elevation
and windage dials with audible clicks.
Windage and Elevation Adjustments
1. Turn the adjustment knob in the
appropriate direction: Up/Down or
Left/Right as indicated by the
arrows.
2. Following the directional arrows,
turn the knobs in the direction you
wish the bullet’s point-of-impact to
go to.
To make adjustments:
Turn Side Focus Knob
Elevation
Knob
Windage Knob
This Viper HS-T riflescope uses finger-adjustable elevation and windage
turrets with scales measured in minutes of angle (MOA). MOAs are unit
of arc measurements which equal 1.05 inch for each 100 yards. Examples:
2.1 inches @ 200 yards, 3.15 inches @ 300 yards, etc.
Each click of the turret moves the point-of-impact .25 MOA for each 100
yards. For example, .25 MOA equals .26 inches at 100 yards, .52 inches at
200 yards, .78 inches at 300 yards, and so on.
MOA Adjustments
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