The PolypLab Polarized Lens with Focus is an independent lens designed to be used with the PolypLab Coral View Lens Kit (sold separately) which clips on directly over the camera lens of smartphones as a way to enhance any pictures taken of coral species. The 37mm lens features an adjustable focus for precision polarization and to reduce any glare coming off the aquarium. Take your photo game from amateur to professional and be the envy of all your friends and family.