Don't know about Alpen. I use Leupold 10x42 Wind River Cascades. They are excellent and I wouldn't trade them for Nikons or any other...well maybe Swarovsky.
No Nikons though (unless someone was paying me to put little yellow Nikon stickers all over my stuff
Pro Staff: Bowtech, Alpen Optics, ThermaCELL, Hawglite, RedHawk Archery, StarrFlight Archery, ProString, Valkyrie Archery, Global Outfitters, Buck Bomb, Mossy Oak