Adjusting parallax...
Side knobs (side-focus) are the way to go IMO. Laying on your belly when using a bipod to draw down on a distant pronghorn or groundhog requires most of us with "older eyes" to get the parallax adjusted out of our view. Some scopes like Leupold can be fairly forgiving in terms of "'depth' of view" but unless your stock fits the same in the prone position as it does when you are standing you are best served by getting the right distance dialed in. Misalignment of the eye with the scope's optical center is the heart of the problem, or so I've been told.
Still think that the Nikon Buckmasters series offering side-focus at a reasonable price as in their 4.5-14x and their 6-18x equipped with this feature offer a combination of quality and price that is hard to beat. Hearing that the new Redfields are close to being released, made in the U.S. and with some models offering the side-focus feature. Once had a 6-18XAO Golden FiveStar on a '250, and it offered very good light transmission although the objective focus arrangement on that model--complete with a locking ring--was a real pain.
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