Abstract: A riflescope includes an objective lens component slidably supported on a guide track oriented perpendicular to an optic axis of the objective lens component for lateral, non-pivoting movement of the objective lens component in or along a plane perpendicular to the optic axis. Movement of the objective lens component shifts an image of a target in the field of view relative to an aiming mark displayed in the riflescope. In a preferred embodiment, a transparent optical window is fixedly mounted forwardly of the objective lens element and sealed to the riflescope housing.

Abstract: A reticle for a projectile weapon aiming device, such as a riflescope, includes a primary horizontal sight line that intersects a primary vertical sight line to define a primary aiming point. A circle is centered on the primary aiming point to intersect the primary horizontal and vertical sight lines. Multiple aiming marks are preferably spaced apart along the primary horizontal and vertical sight lines and cooperate with the circle and the sight lines to form horizontal and vertical scales for estimating a range to a target having features of known or estimable size. The scales also facilitate windage and holdover aiming adjustments. The circle may facilitate quick target acquisition in rapid fire engagements, as well as enhance range estimation capabilities.