Opteka .42x HD&sup2; Wide Angle Macro Fisheye Lens for Canon EOS / EF Included with the lens is the box, instructions, carry pouch, front and rear caps, and a 58mm to 52mm converter ring. You can screw this lens onto the front of any existing lens, provided it has either a 58mm or 52mm thread. Also the back part is removable, so it can be used as a macro lens.