Designed and built to achieve a supreme optical quality, the Konus Emperor 10x42 WP/WA will leave you breathless with the impeccable brightness and clarity of their special BAK-4 prisms with Phase Correction. This is an advanced coating technique that will force the light beams back into phase, thus improving the image definition and contrast and creating a sharper view, especially noticeable when observing fine details. The other features of the Emperor binoculars are: waterproof and nitrogen purged body, wide angle eyepieces, extra long eye relief and twist up eyecups, along with an attractive and edgy design.