I USE THESE GLASSES DAILY ON XCOUNTRY HIKES IN LOCAL PARK WITH LONG, OPEN VISTAS AS WELL AS FORESTED AREAS. LIGHT AND COMPACT (AS ADVERTISED). THE ONLY PROBLEM IS PLACEMENT OF DIOPTER FOCUS AT FRONT OF LEFT LENS. IT IS VERY HARD TO HOLD THE UNIT STEADY AND FOCUS DIOPTER ADJUSTMENT KNOB.