Vortex Optics RAZOR HD 5-20X50 RIFLESCOPE — First Focal Plane - Manual (Page 5)

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The Razor HD 5–20x50 riflescope uses a side focus parallax
adjustment which, when properly set, eliminates parallax
errors. Properly setting a side focus parallax adjustment is a
quick procedure. When properly set, the target image should
be sharp and crisp.
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.
Parallax Adjustment
Vortex Razor riflescopes use a fast focus eyepiece designed
to quickly and easily adjust the focus on the riflescope’s
reticle.
Reticle Focusing
Note: 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.
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.
Try to make this particular
adjustment quickly, as the
eye will try to compensate
for an out-of-focus reticle.
To adjust the reticle focus:
1. First, be sure the reticle is correctly focused (see Reticle Focusing).
2. As accurately as possible, match the yardage number (distance you
are shooting) on side focus parallax adjustment knob to the indicator
arrow on the scope body.
3. Check the setting for accuracy
by moving your head back and
forth while looking through the
scope. The setting is correct if
there is no apparent movement
between the reticle and target. If
there is apparent movement, adjust
the focus knob slightly until the
movement is eliminated.
To set the parallax:
Adjust the reticle focus
Adjust the side parallax knob