Nedis 8x21 Compact Roof Prism Binoculars, Lightweight Portable HD Lens, Rubber Grip, Dioptric Correction, Ideal For Bird Watching, Hiking, Travel, Sigh

Brand  NEDIS  This lightweight binocular can easily be taken with you when you are hiking or travelling. The rubber grip on the housing makes sure you have a firm grip and offers good protection. The dioptric correction makes it possible to adapt the eye pieces to every eyesight.The best viewing result with this binocular is during the day time.This model is a Roof Prism type binocular.Details• The binocular has a magnification of 8x. The magnification number indicates how many time an object is magnified by the lens. The larger the number the higher the magnification.For a binocular with magnification 7 or 10 is most useful. When the number is higher it will result in less stability of the image.• Objective lens diameter: 21 mmThis indicates how much light is let through the binocular lens. The bigger the lens the more light comes in but also means the binocular will be more heavy.• The field of view at a 1000 meters distance is 128 meter. Making it ideal for moving objects like birds and planes.• The binocular is best used during day time. It has an exit pupil diameter of 2.7 mmThe darker the environment the larger your pupil will become. When your pupil becomes larger than the exit pupil diameter visibility will be less clear.A human eye pupil diameter can change from 2 mm up until 7 mm. So in case you expect use a binocular often in the dark then a high exit pupil diameter will be important. 7 mm can even be used at night. 5 mm is suitable for dusk and dawn. Under 5 mm is more suitable in day-time.• This binocular can handle an Interpupillary distance (IPD) of 29 - 69 mmThe Interpupillary distance (IPD) is the distance between the centres of the pupils of the eyes. This is different from person to person and also depends on whether they are looking at near objects or far away• Due to eye-relief of 10.5 mm this binocular is less suitable for spectacle wearersEye relief is the distance from the last surface of an eyepiece within which the user's eye can obtain t