All swarovski eyepiece lenses are 100 watertight including this zoom model the fully adjustable eyecup with its large diameter opens up the full field of vision 36 20m at 1000m even for eyeglass wearers providing a very comfortable viewing feel and the eyepiece is fitted with an integrated quick release lens cover the new s lenses also come with the unique swarotop coating for bright and contrast rich images whatever the light conditions