Hong Kong-based filter manufacturer H&Y Filters announced a Magnetic Holder Cap for their signature Magnetic Filter System. Bound by strong magnetic force, the $24.99 cap provides strong protection of the lens when the holder is up. Aligned with K-series Magnetic filter system, the cap is made of light-weight and tough CNC Machined Aircraft-grade Aluminium. Magnets are embedded on the sides of the cap to achieve strong and solid magnetic force. Simply one-clip, the holder cap is on, and lens with the holder on is immediately under protection.
H&Y says the K-series Magnetic Filter System was the first-ever patented magnetic system ever designed for square filters. Magnets on the holder and magnets on filter frames engage filters and holders together.