Vortex Optics VIPER HS 4-16X44 LR RIFLESCOPE - Manual (Page 5)

HS LR
RIFLESCO PE
Viper HS LR riflescopes use a side focus adjustment which provides
maximum image sharpness and eliminates parallax error.
Using the Side Focus
1. Be sure the reticle is correctly
focused (see Reticle Focus 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.
Setting 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. 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.
Adjust the side focus knob
Customizable Rotational Stop (CRS)
Viper HS LR 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 HS LR 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.
CRS Shims
See CRS shim installation
in the Bore Sighting and
Final Range Sight-in sections
on pages 12–13 for more
information.
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