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Phase correction is a set of coatings on the prism glass of roof prism binoculars that keeps light in correct color phases. These coatings are only needed on roof prism binoculars to enhance resolution, contrast, and color fidelity.
The top half of this image shows the benefits of phase correction.
Our Eagle Optics professionals are available to answer your questions at 1-800-289-1132 or firstname.lastname@example.org.