parallax adjustment

Parallax adjustment is a feature on optical devices like rifle scopes and binoculars that corrects for the apparent shift in a target's position when the viewer's eye moves slightly off-center.

Without this adjustment, the reticle or crosshairs may appear to drift relative to the target, reducing accuracy.

Most quality scopes include a parallax adjustment knob or ring that lets shooters fine-tune focus for specific distances.

I dialed in the parallax adjustment before taking the long-range shot.