VANGUARD ZR103050R Zoom 10 30x50 Binoculars with RubyCoated Lenses 3.8 angle of view, 198' field of view at 10x2.0 angle of view, 105' field of view at 30xZoom feature lets you focus on an object and then zoom in to examine details using a higher magnificationRelative brightness 25.0-2.8, twilight factor 23.3-38.0Rubber armored surfaceIncludes carrying case and neck strap