Thanks to a 14x magnification and a 52 mm objective lens diameter, the NL Pure 14x52 are excellent professional binoculars for observations at long distances and in difficult light conditions. Huge 14x magnification, ideal for professional birdwatching Strong twilight performance thanks to a 52 mm objective lens diameter Good field of view of 93 m/1,000 m (102 yds/1,094 yds) Comfortable handling thanks to the NL Pure wasp waist SWAROVISION technology with field flattener lenses offsets the curvature of the field of view to provide exceptional edge sharpness -13 to +131 degF functional temperature 13 ft/4 m water depth (inert gas filling) submersion tightness