Parallax Knobs; A Misnomer???"

[AR15barrels]

With these normal variables for a given zoom range in a scope, there'll be less error at the lower magnifications, more error at the higher ones.

This is exactly what I have observed.

And I happen to work for a lens company...
We would never accept a lens assembly group that was off by a few percent.
We would only accept a group that was off by a few hundredths of a percent.

 

[Bart B.]

AR15, I used to shoot smallbore matches with a guy that worked for Redfield at their Denver plant. He said once that lots of scope company practices are to sort each batch of lenses into those with a very small tolerance to be used on high dollar scopes. Lenses with larger tolerances were put in lower priced ones.

Some years ago, Lones Wigger (Olympic and other Int'l Gold Medalist) brought me one of Redfield's new zoom target scopes to test on my collimator. When zoomed from low to high power then back to low, the reticule moved in a 1.25 MOA figure 8 about the collimator reference. It also had about 1/2 MOA slop in reticule position from simulated recoil. No wonder he didn't like using it for even light recoiling .22 rimfire match rifles.