Swarovski Habich 10x42 for hunting, birding, or any serious/critical/extended use. There's a set of cheap Nikon 7x50 roof prism glasses hanging off the passenger headrest in my truck, adequate for a quick glance at something distant, but you'd prefer an honest migraine to using these for more than a few minutes. For light-duty,short-term use such as while traveling and sightseeing, a tiny, cigarette-pack-sized set of Swarovski compact 8x20's fills the bill, with performance of much greater proportion than its diminutive size ---another example of getting even a little more than you pay for with high end optics. And,in my "tactical" attache case, there's a tiny Zeiss monocular, not much larger than a fountain pen, which has paid for itself when no other optic was at hand, and, because, like some travelers described to Dorothy by the Scarecrow, it "goes both ways", i.e., it serves as both a tiny telescope, and also, a miniature magnifier.