I had high hopes for these but was disappointed soon after opening the box. The glass seems to be quality but that's where it ends. The housing seems cheap and the plastic focus is even worse. There is no smooth focus like in a pair of vortex glasses. The focus jumps and constantly needs to be refocused. For the same money you can purchase a quality pair of vortex glasses that are 10X the quality of these. They seem like a cheaply made Chinese product.