For Bossdun 12x42 Binocular: Construction offers structural integrity along with light weight. 12x magnification and larger size objective lens provides clear and sharp brighter images with real life colours. The high quality BaK4 type prisms and multi coated optics offers maximum light transmission and reduce glare from the lens surfaces. Higher eye relief facilitates the best adjustment to glasses wearers and non glasses wearers. The binocular offers interpupillary distance adjustment for better individual viewing. The large size central focus wheel equipped with ridges offers easy adjustment with a finger tip movement. The binocular is best choice for hunting, wild life view, nature view and out door activities. Type:12x42 Binocular. Magnification 12x cannot be Adjust Eyepiece diameter: 18mm Objective lens diameter: 42mm Exit pupil distance: 17.1mm Exit pupil diameter: 7.1mm Angle of View 5.6 Field of view: 101m/1000m Prism type: BAK4 Prism diameter: 16.95mm Lens type: Full optical glass lens Lens components/group:6 pieces, 4 groups Lens coating: FMC multi-layer green coating Waterproof level: Nitrogen filled waterproof Product size:145mmx125mmx53mm Tripod interface:Universal camera tripods Colour:Black Material:ABS Package Contents: 1 x Binocular 1 x packaging box 1 x shoulder bag 1 x Hanging rope 1 x eyepiece cover 1 x objective cover 1 x lens cleaning cloth 1 x Mobile phone holder 1 x English instruction manual