Increasing the magnification of a pair of binoculars will decrease the size of the exit pupil and decreasing the magnification will increase the size of the exit pupil. So, simply, there is no light on the outer edges of your pupil and thus the dark areas. For example, a close focus of 10 feet means you can get a clear focus on an object as close as 13 feet to you. The shorter the close focus distance, the more one can focus on details that are not visible to the naked eye. ![]() The reason for this is that the exit pupil is smaller than your own pupil when viewing through the binoculars. This number tells you the minimum distance the binoculars can focus on. Larger exit pupils are preferred as the ease of viewing is improved less “dark circled edges” are visible in low light conditions and even eliminated during good light conditions. The exit pupil size indicates the size (in diameter) of the light beam exiting the binoculars at the eyepiece. Each binocular comes with some numbers written in a particular format. It should, however, be noted that there are other factors that influence the light-gathering capabilities of the binoculars such as the refractive index of the glass and coatings used to reduce this figure but can be ignored for now.Ī larger front diameter will also give you a larger exit pupil (if magnification is kept constant). The reason for this is that an increase in the front element’s diameter will increase the light-gathering capabilities of the binoculars. Now, lets get a little more technical: All binoculars have a pair of numbers associated with them - the magnifying power times (X) the objective lens size. ![]() Theoretically the larger the front element of the binoculars, the better the image result will be. Why is the diameter of the front element of any importance?
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