This 58mm to 72mm step up ring allows you to use 72mm filters on a 58mm lens filter thread adapter rings serve to accommodate filters close up lenses and other attachments to lenses with different filter thread sizes not only does this save money that can be invested in a greater se lection of filter types it also saves space and weight in the gadget bag caution when a smaller filter is adapted to a lens with a larger filter thread there is the probability of vignetting