Additionally, the 8x 42s feature a roof prism system which allows for a smaller, more streamlined shape and greater durability than the 7x50s' porro prism system which offers greater depth perception. Otherwise, the 8x 42s feature the same 100% water resistance and BaK-4 prisms as the rest of the H2O line.
The 8x 42s' roof prism system features prisms that overlap closely, allowing the objective lenses to line up squarely with the eyepiece, resulting in a streamlined look and greater durability than porro systems. Their BaK-4 glass prisms provide the 8x 42s with sharp images from edge-to-edge as well as improved brightness over typical BK-7 glass. Meanwhile, the 8x 42s are 100% waterproof due to an O-ring seal and nitrogen purging, ensuring optimal performance even in fog or rain.