“Phase-corrected” (PC) coatings

In addition to the normal requirements of optical coatings, coatings of roof prisms binoculars will also have to be “phase-corrected” (PC). In the case of roof prism binoculars the beam of light entering the instrument through the objective lenses is split into two and brought together again. This process results in a phenomenon known as “phase shifting”, and presents itself in the form of decrease in contrast and image brightness. This has to be corrected and it is done by special coatings, known as “phase-corrected” (PC) coatings.

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