RIFLESCOPE
RIFLESCOPE MANUAL
1-4x24 with Uncapped Turrets
RIFLESCOPE
The Vortex® Viper® PSTtm 1-4x24 Riflescope
Specifically designed for the tactical, law enforcement and committed precision shooting communities, the Viper®PST 1–4x24 riflescopes offer 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 PSTs are ready for any situation.
Fast Focus Eyepiece
Illumination
Adjustment Knob
Ocular
Lens MagView Indicator Elevation
Adjustment Knob
Turret Shroud
Reticle Focus
Magnification
Adjustment Ring
Windage Adjustment
Knob
Objective
Lens
Dual Use: Shooting Tactical / Hunting
US Patent 7,937,879
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Second Focal Plane Reticle
This PST riflescope model uses a second focal plane (SFP) reticle. The advantage of a SFP reticle is that it always maintains the same appearance. Shooters using reticle hashmarks should be aware that the listed subtensions used for estimating range, holdover, and wind drift correction are only accurate at the 4x magnification.
The Subtension Scale: MOA or MRAD
Depending on which version you have purchased, your Viper PST 1–4x24 riflescope will feature adjustments and reticles scaled in MOAs or mrads. If you are unsure of which scale is used, reference the top of the adjustment turret.
If the adjustment is in MOAs, |
If the adjustment is in mrads, |
the turret will display |
the turret will display |
“1 Click = 1/2 MOA”. |
“1 click = .2 mrad”. |
Both minute-of-angle (MOA) and milliradian (mrad) unit of arc scales are effective when ranging or adjusting riflescope for bullet trajectory.
RIFLESCOPE
MOA Adjustments
MOA unit of arc measurements are based on degrees and minutes. There are 360 degrees in a circle and 60 minutes in a degree for a total of 21,600 minutes (MOA) in a circle. A minute of angle will subtend 1.05 inches at a distance of 100 yards. Viper PST 1–4x24 riflescopes with MOA adjustments use 1/2-minute clicks which subtend .52 inches at 100 yards, 1.05 inches at 200 yards, 1.57 inches at 300 yards, etc.
MRAD Adjustments
Mrad unit of arc measurements are based on the radian. A radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. There are 6.283 radians in all circles and 1000 milliradian in a radian for a total of 6283 milliradians (mrads) in a circle. An mrad will subtend 3.6 inches at a distance of 100 yards. Viper PST 1–4x24 riflescopes with mrad adjustments use .2 mrad clicks which subtend .72 inches at 100 yards, .1.44 inches at 200 yards (4 cm at 200 meters), 2.16 inches at 300 yards (6 cm at 300 meters), etc.
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Riflescope Adjustments
Reticle Focus
Vortex Viper PST riflescopes use a fast focus eyepiece designed to quickly and easily adjust the focus on the riflescope’s reticle.
To adjust the reticle focus:
1. Look through the riflescope 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.
Adjust the reticle focus.
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.
Warning
Looking directly at the sun through a riflescope, or any optical instrument, can cause severe and permanent damage to your eyesight.
About Parallax
This Viper PST 1-4x24 riflescope does not have a parallax focus and is factory focussed at a distance of 100 yards. Using good consistent shooting form and cheek weld when shooting at distances other than 100 yards will minimize most error problems associated with parallax.
RIFLESCOPE
Windage and Elevation Adjustments
Vortex Viper PST riflescopes incorporate precision finger adjustable elevation and windage dials with audible clicks.
To make adjustments: |
Elevation |
Knob |
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1. Turn the adjustment knob in the |
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appropriate direction: Up/Down or |
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Left/Right as indicated by the arrows. |
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2. Following the directional arrows, |
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turn the knobs in the direction you wish |
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the bullet’s point-of-impact to go to. |
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Windage Knob
MOA Adjustments
With each click of the Viper PST moving the point-of-impact 1/2 MOA, it will take two clicks of the knob to move a bullet’s point-of-impact 1.05 inches at a 100 yard sight-in distance.
MRAD Adjustments
With each click of the Viper PST moving the point-of-impact .2 mrad (.72 inches), two clicks will move the bullet’s point-of-impact 1.44 inches at a 100 yard sight-in distance. At 100 meters, two clicks will move the point-of-impact four centimeters.
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