The relationship between the Exit Pupil and your eyes pupil diameter is important This is tiny and will almost certainly be smaller that the size of the pupils in your eyes in all but the very best light conditions when your pupils are at their smallest: I am not surprised that the 20x40 Bushnell's that your friend gave you were difficult to use as they produce a shaft of light that exits they eyepiece ( exit-pupil) that is only 2mm in diameter (40 ÷ 20 = 2mm). Remember, the most powerful binoculars are not always the best option and sometimes it is better to hold back a bit as there are many other important factors to consider when choosing the best long distance viewing binoculars for your specific needs: Magnification & The Exit Pupil Many people make the mistake of assuming that in all cases and for all uses, a larger magnification or more powerful binoculars will be "much better" than those with lesser powers. If you need more info on this, take a look at my page on What To Look For When Buying Binoculars that includes a section explaining all about what the numbers mean. Thank you very much for the questions, which I will try to answer to the best of my ability and knowledge:įirstly your friend is right in saying when describing a binocular, the first number is the magnification, so your Zeiss Dialyt 10x40B has a magnification of 10x, whilst the Bushnell 20x40 will magnify the image a massive 20x.
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