Nedis Scbi4000bk 10x Binoculars Black

-The binocular has a magnification of 10x.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:42 mm.This 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 96 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 4.2 mm.The 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