The New Magnetic Control System (MCS) by Tiffen is an elegantly simple way to harness magnetic power to swiftly and securely attach Tiffen filters to lenses’ fronts. 

This is a replacement MCS System Lens Cap. It requires the MCS Adapter Ring or Filter to attach. 

Developed to eliminate the hassle of threading filters on and off, while maintaining a safe and positive lock, MCS makes installation and removal lightning-fast. 

• Works with off the shelf lenses when fitted with either MCS Adapter Ring or Filter. 
• Fits our 82mm, 77mm and 58mm MCS adapted lens fronts with step-up rings for other sizes.
• Fast and easy, no tools needed for installation.
• No lasting modification to the original lens.
• Filter Instantly attaches to Magnetic Holder.
• Each MCS filter comes with a front and rear magnetic lens cap.