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It is a bit difficult to visualize, but here is my understanding.
The scope forms an image of the target at certain focal plane. When the focal plane coincides with the reticle, there is no parallax. Say the shooter's eye shifts to the left by a small distance. He still focuses on the reticle. His line of sight is now deviating from the scope's axis by a small angle A.
No problem with zero parallax. The reticle is always on target. With parallax, however, there is distance between the target image and reticle. With angle A, the image remains the same, but the reticle appears to move, the direction of which depends on the target distance. It moves with the eye when the distance is less than the scope's parallax setting, and the other way otherwise.
If the shooter chooses to realign the reticle with the target, the poi will be off. The amount in moa is the same as angle A, if the scope has 1x magnification. The error in moa actually decreases at higher magnification.
Now it is all about angle A. Parallax will become a non-issue if angle A is very small. But how?
-TL
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