Nothing changes the way you see the world like High Definition II and no company does High Definition II like Opteka. Opteka's glass optics defines High Definition. Change the way you view the world. Enjoy outstanding detail, enjoy enhanced clarity and enjoy Opteka. The new Opteka High Definition II 0.35x Ultra Wide Angle Fisheye Converter Lens increases the versatility of your existing lens to provide breathtaking ultra wide angle views. And it's so easy to use! Additionally the built-in detachable macro lens allows you to take extreme high resolution close-up shots! Opteka lenses put more creative control where it belongs - in your hands.