It’s because we sweat the details that you’ll be able to see more details with the BX-1 McKenzie. The BAK4 roof prism design gives you better resolution than others in its class, in a compact design that feels good in your hands. features phase-corrected BAK4 roof prisms and anti-reflection fully multi-coated optics to produce a versatile and capable optic with accurate high-contrast color rendition, and bright and clear images. Coupled with the optical features are 42mm diameter objectives that give the binocular very competent low-light performance.