High-Index / Low-Dispersion 2 Element Optical Glass High Definition (Beveled Design) +10 Close-Up Lens Fully Multi-Coated & Threaded Anti-Reflection Coating High Speed Auto-Focus / Infrared Compatible macro lenses turn your video or photography lens into a true macro lens. They provide lenses with more close-up range and magnification, without compromising image quality. They are also designed to maintain a flat field and edge-to-edge sharpness without chromatic aberration or image degradation. They provide dramatically shorter MOD (Minimum Object Distance). This is essential whenever it is necessary to focus tightly on a small subject with a long lens - in tabletop, miniature and flat field videography. For example, add this 10x diopter to a 14x lens with an MOD of 40", and bring it down to 2", filling the frame with a subject as small as 3/4" across. Made to withstand the elements with a heavy duty, water-repellent chassis. The sturdy, long-lasting material is double bonded so it will hold up and keep your glass protected for years to come. Made with fade-resistant materials to retain its original crystal lens for years to come.