I have a pair of Swarovski 10x42 EL and I've bought and used both the Swarovski brand adapter, and the Outdoorsman brand. The Swarovski may appear flimsy for the price, but it is designed like it should be and that is pivot in the center of the binos. You also do not have to spread the binos (to fit on the adapter), and then readjust for pupillary distance, which I have to do for the Outdoorsman. The Outdoorsmans are strong, maybe faster to install, remove from the tripod, but the designer must have never set and glassed for Coues very long. Since the attachment pin is put into the hinge mechanism on the objective lens end of the binos, that becomes the pivot point. This creates a longer radius to the eyecup, which creates more head,neck, and body lean to scan the same depth of field compared to an adapter that pivots in the center of the binos(longer radius equals greater circumference).