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Bushnell 10 x 25 Binocular
Optical consequences of the design are that roof prisms are more expensive to manufacture than porro binoculars of the same quality and require phase distortion coatings to eliminate the reduced contrast and sharpness caused by phase distortion a roof prism phenomenon. Roof prisms also produce a more photographically normal depth perception than porro prisms because the lens barrels are in line with the eyepieces. Roof prism designs have straight barrels with the front objective in-line with the eye piece. This design architecture makes it possible to produce more compact binoculars than porro or inverted porro designs.
