What does the side dial on a telescopic sight control?

The side dial on a telescopic sight is designed to control the vertical reticle adjustment, allowing the shooter to make precise vertical corrections to the aim point. This adjustment is crucial when compensating for factors such as bullet drop due to distance or when shooting at various angles.

When a shooter rotates the side dial, they can elevate or lower the crosshair to align with the target accurately. This is particularly important in long-range shooting, where even minor misalignments can significantly affect accuracy. Controlling the vertical reticle helps ensure the shooter can effectively compensate for these factors and hit their intended target consistently.

The other options relate to different aspects of the scope's functionality. The maximum range of the scope would be determined by its design and optics, not a side dial. The magnification level is typically adjusted by a separate power ring located on the eyepiece or near the objective lens. The horizontal reticle, like the vertical reticle, is adjusted by a different dial or turret, usually located on the top of the scope.