nikon monarch 5 binoculars, black (12x42) bundle with a lens pen and lens cloth nikon the nikon monarch 5 12x42 with a carrying case, neck strap, lens caps, nikon lens pen, and lumintrail cleaning cloth built with ed (extra-low dispersion) glass lenses, which correct chromatic aberrations across the furthest limits of the visible light range and effectively compensate for color fringing. even when observing objects that would make chromatic aberration the most apparent – such as adjacent whites and blacks – the images will maintain superior contrast and resolution thanks to the ed glass lenses. multilayer coatings, which provide an even higher light transmittance across the entire visible light spectrum, are applied to all of the lens and prism surfaces that transmit light. this minimizes the loss of light due to reflection, thereby ensuring a more natural, clearer view.turn and slide rubber eyecups allow users to adjust for a custom fit, durable rubber armored body for non-slip grip, smooth central focus knob, and nitrogen filled and o-ring sealed for complete waterproof and fogproof performance. specifications:focusing system: central focusmagnification: 12 xobjective diameter: 42 mmangular field of view (real): 5°angular field of view (apparent): 55.3 °fov at 1000 yds: 261 ftclose focus distance: 7.8 ftexit pupil: 3.5 mmeye relief: 15.1 mmsize (length x width): 5.7 x 5.1 inweight: 21.6 ozphase coating: yesdielectric coating: yeswaterproof/fogproof: yesprism: roofed glass: yes