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The BX-4 Pro Guide HD Gen 2 binoculars come with three sets of interchangeable form-fit eyecups for comfortable viewing. The low eyecups provide a maximum field of view for those who wear eyeglasses, the medium eyecups provide a versatile function for most viewing occasions, and the winged eyecups block out peripheral light for maximum detail. Swap them easily by removing the rubber from the binocular eyepiece and replacing it with whichever size you choose. #leupoldoptics
