Parallax is a phenomenon in physics that describes the apparent movement of an object relative to an observer due to a change in the observer's position. In the context of optics, parallax often occurs as a difference in the view of an object when viewed from different angles. In shooting optics, a side adjustment knob can be used to eliminate parallax, meaning that the angle of view changes, but the sight picture remains stable.

So...

Parallax is a phenomenon that can affect shooting accuracy, especially when using scopes at long distances. Imagine looking through a scope at a target, let's say, 100 meters away. If your eye or head moves slightly, it may seem like the target shifts in relation to the crosshair of your optic, leading to inaccuracies in aiming and shooting.

For example, when looking at a target through a scope and moving your head slightly to the right or left, it may seem like the target moves in the opposite direction. This can cause the aim of the firearm to be off from the precise point you intended.

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