The Nikon Venturer LX is a top of the line binocular, I believe them to be in the same class as the Swarovski and Leica glass. But why does Nikon not make them water proof?

My dad use to use a Tasco scope on his Browning 30-06. Then onemorning on a late Nov. Elk hunt, he pulled up to shoot anice 6x6 bull andfoundthat his scope was fogged and the crosshairs were gone!Needless to say, he didn't fill his tag that year, and our family stays away from Tasco.