The powerful magnification allows for detailed observation of distant subjects; Larger objective lenses improve light-gathering ability without adding excessive bulk or weight; Roof prism light path ensures optical tubes remain thin for a compact form factor; High-eyepoint design provides ample space between your brow and the eyecups for a clear field of view, even when you're wearing glasses; Closed-bridge configuration provides a solid and stable platform for the internal focusing mechanism; Large slip center focus wheel allows for precise focus control, even while wearing gloves; Right eye dioptric adjustment collar helps to compensate for individual eye prescription; 56-72mm interpupillary distance range allows easy use by a wide variety of people; Environmentally friendly Eco-Glass is made without lead or arsenic; Textured protective rubber armoring provides a slip-resistant grip, especially in cold and wet weather