Magnification: 25x-40x Objective Lens Dia.: 100mm Exit Pupil: 4mm Eye Relief: 28mm Field of View(25x/40x): 2.544m/26m@1000m Weight(Gross/Binoculars/Tripod): 26.7kg/17.4kg/9kg DCHBISW2540100 is a precision optical instrument, the magnification is changeable. It can be used for a wide range of weather conditions. It can also measure the distance from the target, the height and between the two targets. It brings you a clear, comfortable, real and 3D feeling when observing various of targets. The telescope has a diopter adjustment mechanism, which can easily meet the demands of the people with different eyesight, and different pupil distance to see the different distance of the scene. This telescope is a good assistant for entertainment, hunting, shipping, fishing, forest fire checking, all kinds of scientific research and other long-term observation applications.