WHAT IS PARALLAX?
Parallax describes a situation where the focal plane of the object being viewed slightly is offset from the reticle. If you have parallax, you have an optical illusion that must be corrected, otherwise your point of aim may be not be aligned with the intended point of impact.
Parallax should not be confused with focus.
Parallax compensation changes neither the focus of the reticle, nor the focus of the image. When you adjust the parallax knob it moves the planes at which these two objects are in focus so that they share the same plane.
PRE-SET DISTANCE INDICATORS
Every Apex riflescope comes with a wide range of adjustment for the parallax effect.
The distance gradient does not include any physical numbers, but rather interval marks that denote starting points for parallax adjustment. This is due to many physical and environmental factors that can be problematic when correcting for the parallax effect.
Please see the chart below for your reference.
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