Binoculars are so common a companion of outdoor enthusiasts that many pack them with hardly a second thought. They’re tossed into a backpack alongside bug spray, sunblock, and waterproof matches with not half the care afforded the typical cell phone. But to some outdoors groups, binoculars serve a highly specific and eminently indispensable purpose. And there is perhaps no group for whom this rings more true than for bird watchers. If you count yourself among this exceptionally technical clan of hobbyists, here are 10 birding binoculars you’ll want to know more about – even if you know about them already.