Burris Optics 300185 You can spend up to four times as much for essentially the same optical performance you get from Signature Select binoculars, but why would you? The field of view through Signature Selects is exceptionally crisp, clear, and of high contrast, the product of premium optical glass ground and polished to very high tolerances and broad band multi coatings. Features: -BaK4 prisms are produced to the same exacting standards. -Coated with silver to maximize light transmission. -Twist-up eyecups make life easier for eyeglass wearers. -The eye pieces afford ample eye relief. -Waterproof and fogproof. -Highly impact resistant. -A forever warranty is icing on the cake. -Extremely robust outer tubes and internal components. -Adjustment system is repeatable steel on steel with audible clicks. -Double internal spring force. -Some of the competition competitors offer a double spring whereas the double spring is the STANDARD for all Burris products. -Burris uses specially made quad seals to provide double insurance against leakage.