The Metabones/Viltrox Adapter Lock secures speedboosters to the XLCS Cage, eliminating potential mounting failures and relieving strain on the MFT mount. Machined from high-strength aluminum and anodized black, it’s compatible with Metabones and Viltrox speedboosters and various basic adapters.

Please note: This is not compatible with the locking “Cine” style adapters from Metabones.