Re: parallax adjustment
To use the parallax adjustment effectively, move your head right and left, up and down,while adjusting the parallax knob, there will be a point that the crosshairs stop moving on the target. This may or may not be at the sharpest target picture setting focuswise, but it is where you need to be.
And how does parallax setting change POI? If done incorrectly, you will miss alot.