Pentax Papilios are binoculars designed for the butterfly enthusiast. With their 18-inch minimum close focus, using the Pentax Papilio is like holding a microscope in your hand. Pentax Papilios come in 6.5x21 and 8.5x21 versions, and are made with fully multi-coated lenses and BaK-4 glass prisms for excellent image quality.