LEICA Ultravid Blackline Binocular is designed with a combination of phase-corrected BAK4 roof prisms, the proprietary HighLux system, and HDC fully multi-coated optics to produce bright and clear color-neutral images, while fitting comfortably in the hand for long, fatigue-free glassing sessions. The HDC coatings add abrasion-resistance to protect the exterior lens surfaces. For those who want to make detailed observations of plants, small birds and insects this model of the Ultravid has a short 7-foot minimum focus distance to allow viewing without disturbing the subject