WonderPana FreeArc 77mm-145mm Step-Up Ring from Fotodiox Pro, Anodized Black Metal Aluminum Step Up Ring for 77mm Lens Threads to 145mm WonderPana145 Round Filters 145mm x 1mm Standard thread step up ring for all lenses with a 77mm filter thread; Can be expanded for other lenses using additional step rings Industrial Grade Aluminum w/ Anodized Flat Matte Black Finishing Allows WonderPana Filter to fits Standard Lenses Can be upgraded with the WonderPana 66 Bracket which allows the WonderPana 66 filters (6.6x8.5" rectangle size) to fit 24 Month Manufacturer Warranty