Opteka 58mm 0.3X HD2 X-TREME Super Fisheye Lens for Professional Camcorders HD2: High Definition 2, 2x the resolution of standard high definition lenses. DMC: Digital Multi-Coated, Greatly reduces the appearance of lens flare and ghosting caused by reflections. BAB: Internal Black Almite Barrel, Black matte satin finish reduces reflections. BRG: Black Rimmed Glass. Reduces the chance of light reflecting off the edge. High-index / low-dispersion optical glass