Bushnell 8X42 POWERVIEW 2008, ROOF PRISM, MC

#140842

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.

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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.
 
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.

Glass and Prism Quality

Bak-7 Prisms (borosilcate crown glass) are lower in quality than Bak-4 and as an isolated factor light transmission is reduced by 10-15%, resulting in a lower brightness image than that produced by Bak-4 prisms.

Coating Rating

Coatings help improve light transmission, especially in roof prism designs. This binocular is rated as MULTI-COATED, meaning that at least one surface has more than one coating on it.

Special Coatings

None.

Eye Relief

The 17.6mm eye relief on this binocular provides superb viewing comfort for both spectacle and non-spectacle wearers.

Exit Pupil

This binocular has an exit pupil of 5.25mm, for use in dim twilight and dawn light, ideal for hunting, wildlife observation and birding.

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