The High Master model scopes have 2 Super ED lens elements within its new lens system.The Super ED lens element is an improved ED lens element with optical characteristics even closer to pure fluorite crystal lens elements.Pure fluorite crystals have virtually no dispersion that result in chromatic aberration in the image.By using Super ED lens elements, we can suppress chromatic aberration even more than with ED lenses and thus produce a sharper image with greater contrast, while still having a strong scope. – New optical system with Super ED lenses & High-Refractive lenses– Low chromatic aberration image– 52mm Objective : March 48×52, March 40x-60×52 (EP ZOOM), 4-40×52 Genesis– 56mm Objective : March-FX 5-42×56, March-X 10x-60×56, 6-60×56 Genesis