-[A New Rapid Filter System for ND Filters]: Engage & Disengage the Filter Any Moment You need the ND filters. This listing is for 58MM -[Available in All Size & Step-Ups]: There are 49mm 58mm 67mm 72mm 77mm 82mm Rapid Filter mount for your choice. -[Aluminum Alloy , Solid Structure]: Quality Assurance by CNC Process of Aluminum Alloy. -[NONE Light Leak]: When the filter is closed, it is not only fast, but also light leak-free. -[Wide Angle Compatibility]: Compatible with most prime lens and zoom lens. -Wide-angle Lens compatibility The RFS will vignette some wide-angle lenses. -Prime lenses wider than 18MM -Zoom lenses wider than 30MM (These are estimated guidelines as we do not have the resources to test every lens and camera combo)