HS-T
RIFLESCOPE
RIFLESCOPE MANUAL
Second Focal Plane | MOA
HS-T
RIFLESCOPE
The Vortex®Viper®HS-Ttm Riflescope
Specifically designed for the tactical, law enforcement and committed precision shooting communities, the Vortex®Viper®HS-TTM riflescope offers the highest levels of performance and reliability. With features such as matched turret/reticle subtensions, CRS zero stop mechanisms and precision ranging reticles, the Viper HS-T is ready for any situation.
Fast Focus Eyepiece |
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Reticle Focus Ring |
Radius Bar |
MagView
Elevation Adjustment Knob
Side Focus Knob
Magnification
Adjustment Ring
Windage Adjustment Knob
Objective
Lens
Dual Use: Shooting Tactical / Hunting
US Patent 7,937,879
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Reticle Options
The Focal Plane
All riflescope reticles can be termed either first focal plane (FFP) or second focal plane (SFP), depending upon their internal location within the riflescope. This model features the second focal plane design.
Second Focal Plane Reticles
Second focal plane (SFP) reticles are located near the scope’s 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 ideally-sized appearance when shooting with this SFP scope. Be aware that the listed reticle subtensions used for estimating range, holdover, and wind drift correction are only accurate at the highest magnification.
Warning
Looking directly at the sun through a riflescope, or any optical instrument, can cause severe and permanent damage to your eyesight.
HS-T
RIFLESCOPE
Riflescope Adjustments
Reticle Focus
The Viper HS-T riflescope uses a fast focus eyepiece designed to quickly and easily adjust the focus on the riflescope’s reticle.
To adjust the reticle focus: |
Adjust the reticle focus |
1. Look through the riflescope |
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at a blank white wall or up at |
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the sky. |
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2. Turn the eyepiece focus knob |
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in or out until the reticle image |
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is as crisp as possible. |
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Note: Try to make this particular adjustment quickly, as the 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 riflescope. However, because your eyesight may change over time, you should re-check this adjustment periodically.
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
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Windage and Elevation Adjustments
The Viper HS-T riflescope incorporates precision finger adjustable elevation and windage dials with audible clicks.
To make 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.
Elevation
Knob
Windage Knob
MOA Adjustments
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.
HS-T
RIFLESCOPE
Image Focus and Parallax Correction
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.
Using the Side Focus
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.
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.
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