SUPER EBC FUJINON multi-coating increases light transmittance for bright, natural color reproduction ED lenses - These lenses have special glass with a low refractive index, reducing chromatic aberration for a clear view. Advanced operability and premium design - The ergonomically engineered, easy grip body shape features high-quality metal texturing and slip-resistant elastomeric material to ensure excellent hand-held stability. With the addition of long eye relief for easy use even when wearing glasses, the the result is absolute user confidence. Excellent reliability that withstands outdoor use in harsh conditions - A robust magnesium body that is both fog-proof and water-resistant is complemented by a water-repellent coating on objective lenses and eyepieces. Add PL and nebula filter compatibilityinto the mix and you’re ready for a wide range of conditions. M46x0.75 Water-resistant - These binoculars are airtight and nitrogen purged.