The PolarPro Macro Lens for the GoPro Hero4 is an excellent tool for capturing detailed close up shots. This macro lens reduces the cameras focal length allowing the Hero4 to focus between 3 to 12 inches. Without a macro lens the GoPro will not focus on anything closer than 12 inches away. The PolarPro macro is a great creative tool for capturing creative close up videos or photos. Perfect for adding into Gopro edits as creative transitions. The Macro Lens features a snap-on design for quick installation/removal. Featuring a glass lens, the PolarPro Macro Lens offers pristine optics as well as maximum scratch resistance. The macro is a great lens to have in your bag as it expands the capabilities of the GoPro Hero4's focal range dramatically.