In pursuit of "taste" in all usability and depiction, the focal length, the lens is a series of high-performance, light and thin. I adopt the entire line-up and HD coating is anti-reflective technology advanced, the SP coating water-repellent, oil repellent, and scratch-resistant. Hue and rich depiction crisp, stimulates the shooting motivated comfortable operation feeling. [Finishing materials and grade] Barrel of course, I am machined aluminum alloy hood and cap. Coupled with functional design that expresses the essence of the lens, every time you order, the sense of quality that has been condensed in the metal material unique, comfortable weight and feel will be uplifting feeling every time you pick it up. In addition, the distance scale, etc., colored paint on you digging all. Printing is hard to come off, it is the finish to withstand to embezzlement of many years.