The Pentax Z series binoculars promise high level quality and clarity in its entire range. They are built to perform at its best with the new fully multi-coated optics and new enhanced light transmission coatings with Protective lens coating. The ZD 10x50 ED has 10X magnification and 50mm lens objectives which incorporates hybrid aspherical lens element with phase correction to clearly see your angle of view in its clearest perspective. Combined to the lens elements is the ED element (extra-low dispersion glass) which not only provides Apochromatic lens effect but also guarantees more compact and lighter weight in addition to its magnesium alloy construction. The Z series binoculars are also waterproof, nitrogen-filled and unique hydrophobic coating .