Steve Kelley | In world of NFL coaching, Jim Zorn has arrived. Originally published November 24, 2008 at 12:00 am Updated November 23, 2008 at 10:15 pm. On Sunday, as the Seahawks lost for the ninth time in 11 games and the fourth time in a row, it is worth taking a moment to celebrate Jim Zorn's success. Share story.
Eye relief refers to the distance between your eye and the lens at the rear of the scope that will give you a full crisp view, no dark ring around the edges. Important to know for high recoil calibers to avoid a black eye or worse. Some scopes are single power (3Ã32, 4Ã30 for example) which means no adjustments.
One principle of scope optics is the longer the eye relief, the more flexible it is. While 4 of eye relief may be optimum in a certain scope, you wil also be able to place your eye 3.5 or 4.5 behind the scope and easily pick up the entire field of view, or close to it. With 3 of eye relief there is much less flexbility. The downside is that longer eye relief results in a smaller field of view, everything else being equal. This is why a Scout scope has a very tiny field of view. Magnification, of course, also has an effect on FOV, as does the diameter of the ocular (rear) lens.