Powerful 10x magnification brings distant subjects in for close observation and identification across wide open ground; 42mm objective lenses keep the overall form factor small while offering the low-light performance required for hunting, birding, and observing wildlife when many animals are most active; Compact roof prism optical path ensures the optical tubes are thin for easier handling; Fluoride glass virtually eliminates chromatic aberration for improved color rendition, resolution, and contrast; Field-flattener lenses improve edge sharpness and lower the distortion; Open-bridge, dual-hinge configuration provides additional gripping surface area for better handling; Large slip-resistant center focusing wheel is easy to manipulate in cold and wet weather, or while wearing gloves; Rapid focusing mechanism allows you to transition from near and far subjects with a quick movement; Bridge design helps to reduce overall weight without sacrificing strength or stability; Lightweight and durable magnesium-alloy chassis