This breakthrough technology developed by Marumi makes DHG Achromat filters ideal for macro photography. Achromat Macro filters are designed to shorten the focal length of your lens and to enhance its macro mode capabilities with outstanding clarity. Other filters can provide simple magnification. Only Marumi Digital High Grade (DHG) Achromat Macro filters provide the full-frame sharpness, detail, and clarity that professionals demand. Marumi Digital High Grade (DHG) Achromat Macro Lenses are available in 2 grades: 330(+3) and 200(+5). Both produce outstanding edge-to-edge clarity that is unsurpassed by any other filter product. These filters are manufactured to the highest standard and feature ultra low reflection coating. The Marumi (DHG) Achromat Macro lens is mounted in specially designed rings that feature a low reflection and satin like finish. They are specifically designed to be the thinnest possible, while maintaining strength and functionality. This allows for the widest possible focus length. Marumi (DHG) Achromat Macro lenses are the highest-grade ancillary lenses on the market today. Made by the worldÆs premier filter manufacturer, Marumi Optical Company of Japan, these filters are a worthy complement to todayÆs most advanced lenses.