The Leupold BX-1 McKenzie line of binoculars is designed to deliver high-end performance without the high-end cost. The McKenzie series combines the handling characteristics of a roof prism binocular with the performance of a porro prism. The BX-1 McKenzie features BAK 4 prisms, very generous eye relief with twist-up eyecups eliminating glare, fully-multicoated lenses, diopter focus and a tripod ready body that is armor coated for toughness to stand up to the elements. The central focus dial is large and easy to find even with gloved hands allowing you to adjust your focus quickly to identify your target. You get the same razor sharp image that you have come to expect from Leupold along with the Leupold Golden Ring Full Lifetime Guarantee.