The BD and the BD XD are different with the BD being the older model. It is however made in Japan and in my opinion of much better build quality. The BD XD is the newer model and is made in China. It does have ED glass and is really pretty good optically except for the slick focus knob problem which I have mentioned above. The older BD model is pretty good also but except for the 8x32 model with 393 ft. field of view, all other models have a pretty narrow fov. Jim