The side focus adjusts the scope's parallax, making the reticle clearer and have less perceived movement when you're shooting at different distances.
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In Second Focal Plane (rear focal plane) scopes, the reticle stays the same size while the target grows and shrinks when you adjust the magnification. These reticles are ideal for lowlight hunting situations and in scopes that don't utilize hash marks for range estimation.
Model #175081 - VX-Freedom 6-18x40 Riflescope with a Tri-MOA Reticle, CDS and a Matte finish
Leupold's Custom Dial System (CDS) gives you the ability to customize your turret (adjustment dial) to your exact ballistics and environmental conditions. Once your new custom dial is installed, simply range the target, turn the dial to that number, and aim dead on.