The viper hds have significantly stepped up their game with hd high density extra low dispersion glass one look is all youll need to appreciate why the viper is an award winning bino add xr fully multi coated lenses and you have a bino that delivers bright crisp details with impressive resolution and colour fidelity rugged compact and lightweightone of the lightest full size binos available its no mystery why the vipers are an award winner the viper hd binoculars pack in all the feat