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8x21 has a wider field of view, more popular than 10X21.
Sorry, there was a problem. Please try again later.8x21 means that the magnification of the object you are view is 8 times its actual size. 10x21 has your object magnified 10 times. The "21" is your object lens, the one you are not lookung through. The lower the number (size) of your object lens the less light enters you binoculars. The larger the object lens size the more light and the brighter and clearer you object that your are viewing will appear.
Sorry, there was a problem. Please try again later.Hi JayBee, Unfortunately, I do not know the difference between the two. I am pleased with the one I purchased as a gift for my Granddaughter who goes camping often. She is very pleased with them. My Best, Kit888
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