I haven't used a Burris Fullfield enough to rate it. However, gun writer, John Barsness, has among many others. In his book, Modern Hunting Optics, he rates numerous scopes in their ability resolve lines at 25 yards in controlled dim lighting. The lowest scoring scopes came in at a rating of 5. The Burris Fullfield II came in at 6+ as did the Leupy VX-2, while the S&B came in the highest at 8.
HTH.
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