Phase coating vs dielectric coating binoculars: why they solve different roof-prism problems
Phase correction and dielectric high-reflective prism coatings solve different optical problems inside roof-prism binoculars. Phase correction is concerned with phase shift at the roof surfaces and its effect on resolution and contrast, while a dielectric mirror coating is used to preserve reflectivity where a prism design needs a mirrored surface. A binocular can legitimately list