The Kiwifotos Step-Down ring is a special ring adapter that allows you to mount your increased/ decreased diameter lens accessories such as filters, adapters, lens, lens hood, lens cap to the camera lens. For example, Canon lens housing has a 58mm threaded port. User can choose a 58-67mm step-up ring to use the 67mm filter on the housing. Take advantage of the economical and effective Kiwifotos solutions without the need to upgrade or change your existing equipment. Simply use this practical adapter and you will be ready to start prompting and shooting.