Rear metal jacket houses taking lens inside a metal jacket, and provides 77mm female thread to screw to the back of Rapido V3 clamp. The external 0.8 module gear controls taking lens's iris. Along with Rapido FMJ and FVD, customer can build an integrated anamorphic lens with a clean & streamline look. If your lens is not in the list, please contact us at info@rapidotechnology.com for customized RMJs.