RevoRing with Polarizer and VND Variable Step Adapter Features RevoRing features unique self retracting blade technology with threaded ends to secure on the front of your lens Each threaded end has been designed to overlap therefore completely removing any possibility of light leak The RevoRing Variable Neutral Density has a dynamic range of ND3 to ND1000, in photographic terms, this equates to 1.5 - 10 stops of light control! All RevoRing products are made using Architectural grade Aluminum, keeping it lightweight and tough. The anodized finish also protects the ring from corrosion when shooting outside in unpredicted elements K-Series Soft GND Magnetic Filter Features Made of Corning Gorilla Glass III Oil/water-proof & double-sided coatings No color cast 100mm x 150mm For 100mm K-Series Filter Holder or adapted holders from other brands Reduce Exposure in Selective Area 9-Layer Multi-Coating Quick Release Magnetic Filter Frame fitted as standard