IMHO, it really doesn't matter in practice. I don't see it and it doesn't appear to influence flyers. I have NEVER seen it occur in a 4x fixed or a variable set to 4x. Crank that same scope to 9x and it becomes obvious. Now, in my opinion, if it were the same, only less obvious, it would still be a factor no matter what the magnification. If it was there only you couldn't see it, you'd be getting unexplained flyers. If you can see it, it is a factor, or can become one, depending on conditions. Either way, I find a higher power variable shooting well under 100yds to be as useful as teats on a mule.