Octopus Step up rings is to install the filter whose size is larger than the filter diameter of the lens. You just need to buy different rings size to attach a bigger size CPL, ND or other effect filters for their different filter diameter lens. For example, if your lens filter size is 67mm and you have 77mm ND8 filter; you only need to get an 67-77mm step up ring to enable you to use your 77mm ND8 filter on your 67mm filter size lens. It will save you alot of money by not buying another 67mm ND8 filter.
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