Operation Manual

67
Customizable Rotational Stop (CRS)
Vortex Viper PST riflescope elevation turrets incorporate the
unique CRS rotation stop feature. After the rifle is sighted in,
the design of the CRS allows a shooter to quickly and easily
return to an original zero point when using the elevation turret
to dial-in temporary bullet drop corrections.
The CRS feature is particularly useful when dialing large
multi-revolution elevation corrections. Without this feature,
the shooter must pay very careful attention when dialing these
large corrections. If the shooter loses track of the number of
revolutions, the original zero point may become lost when
returning the adjustment.
Viper PST riflescopes equipped with
the CRS allow the elevation dial to be quickly spun back to
original zero without having to carefully count revolutions or
clicks.
Once the CRS shims are installed after sight-in, the elevation
dial will stop turning shortly past the original zero point when
being returned (turning clockwise direction) from a temporary
elevation adjustment. The shooter can then turn the elevation
knob a partial turn in a counter-clockwise direction until the
zero reference and radius bar are correctly aligned—achieving
the original zero point.
See CRS shim installation in the
Bore Sighting and Final Range
Sight-in sections.
CRS Shims
This Viper PST riflescope does not have a parallax focus.
The focus is factory pre-set at a distance of 100 yards.
About Parallax
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.
At distances over 100 yards parallax error is minimal; using
good consistent shooting form and cheek weld will prevent
most error problems with parallax.
Subtension
Multiplier Markings
Magnification
Markings
MagView
Variable Power Adjustments
To change magnifications, turn the magnification
ring to the desired
level. The patented
Vortex MagView
will provide a low
light reference
for magnification
level.