Here’s what you call the Whachamacallit on your binocular!

Which is the objective lens? Where is the diopter located? Is it called an eyepiece or an eyecup? Knowledge is power, right? Well, this handy diagram won’t be like a binocular and make you 8x smarter than you were before, but hey, it’s a start. So have at it, and brush up, folks. Oh, and when we say a binocular has bells and whistles, we don’t really mean that!

Originally published on December 5, 2011