The celestron nature dx 12x56 binoculars join celestrons new nature series the perfect companion for the outdoor explorer these feature packed binoculars offer multi coated optics bak 4 prisms and a fully waterproof exterior that is purged with air and filled with dry nitrogen gas to ensure a clear fog free viewing experience they offer a 12x magnification and feature a 56mm diameter making them suitable for low light and general outdoor viewing the bak 4 prisms with phase coating increas