FilterDude -100mm Filter Holder (Foundation Kit) Lightweight filter holder allows the use of 4x4 or 4x5 (100mm) filters to be attached to camera lens The holder can be configured to accept from one to three filters Durable brass quick release provide easy attachment and removal of filter holder from lens Thumb screws eliminate the need for tools when reconfiguring holder Compatible with the LEE 105mm Accessory Front Thread Adapter Ring! (Not Included)