Cheek Pressure

[Alex Wheeler]

I really don't like the comparison here...
A bows peep sight and front aiming pin is only different in configuration to a scope...if your eye is offset in either situation you will be shooting inaccurately....if you see black edges in your scope you are misaligned from back to front....is that not correct....

The way you actually adjust your parallax is to keep moving your head around while tuning the knob until the crosshair stops moving on the target, its not a focus like many believe. The whole point of a parallax adjustment is to make the position of your eye irreverent.

 

[Tommo64]

as long as your parallax is set correctly you may have shadows or un enjoyable viewing but you will not have a poi discrepancy. That's why you can move your head all around when you are parallax free without your reticle moving on the target.

Assuming you have a scope with parallax adjustment. Not all of them do, therefore consistent cheek weld is important in that instance.