“This is a BAK4 or Bk7 ??? Or how can I check it’s prims material ?”

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• The 8x42 Monarch 5 Binoculars feature ED (Extralow Dispersion) glass elements with fully multicoated Ecoglass lenses and phase-corrected roof prisms that produce clear high-contrast images with accurate color reproduction across the entire visible light spectrum. Dielectric high-reflective multilayer prism coating on all lenses and prism surfaces further enhances the optical performance.

  Answered by Birder 4 years ago

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• Visit their website Complete details can be found there.

  Answered by Anonymous 4 years ago

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