As the latest addition to Burris's Black Diamond riflescope series, this 4-16X model, with its 50mm objective lens, is eminently well suited for ultra-long-range big-game hunting or as a dual-purpose scope for big game/varmint shooting-especially in low light. The Black Diamond's exceptionally sharp 3.3 SOA resolution and excellent low-light performance are evidence of its outstanding optical quality. Our test sample was also equipped with a Posi-Lock, which securely locks down windage and elevation adjustments. And Burris's Ballistic Mil-Dot range-finding reticle is practical and unobtrusive. The latter features are optional.