Z-type porro-prism binoculars have a sturdy but unique appearance in which the right geometric prism is employed. They provide superior performance, and the models with large apertures, which easily produce bright views, are offered at reasonable costs. They are recommended for those who are selective about view quality. Vixen Ultima porro-prism binoculars have a less comlplex easy-to-use structure. Multi-layer coating is applied on all of the prisms and lenses, which produces clearer images with sharp high contrasts. Those qualities also gave rise to its name Ultima meaning the ultimate in performance, quality and value.