Originally Posted by WildRose
Just adjust it back and forth until your target image is as clear as possible. If it has range marks on the dial they should be fairly close but don't count on them being at all precise.
Going to have to disagree....a little bit, anyway. I have seen scopes that the best focus and the correct paralex setting were off a bit. All were higher end scopes.
Simply set the crosshair on the target with a steady rest and simply wiggle your head around. If the crosshair moves around off of the aim point, your will need to adjust the paralex knob till head movement will not move the crosshair off of the mothball. If the rest isn't steady enough, then simply find the best focus like Wildrose stated...the little bit that the paralex may be off is a moot point....your rest isn't steady enough for it to make a difference.
Paralex and focus are two different things.