Excerpt: The word “Papilio” is Latin for “butterfly” and the name tells us that the Pentax Papilio binoculars were designed specifically for looking at butterflies. What makes the Papilio a butterflying binocular? The short answer is: the amazing close focus. Pentax lists Papilio binoculars as having a minimum close focus of just 19-20 inches (or about 0.5 meters). When we first received the Papilios, we tried it out and in disbelief tried it again!