I really can't spend the money for a new scope right now but I do have a Vortex 4-12x scope just setting around. It's a centerfire scope and I know the parallax for it is set for 100 yards vs 50 yards on my other scope. The 4-12x scope has no parallax adjustment but I have read where people do some adjusting to the objective end of the lens by turning a lock ring or something. Has anyone here done this with a good end result? And, if so, is there some detailed instruction on how to do this? EDIT TO ADD: I will still mostly shoot at 50 yards, so, that's why I was wondering if the 4-12x scope needs the parallax adjustment changed.