The standard adaptor ring from LEE is crucial to the LEE Filters system, allowing you to attach the LEE100 filter holder to your lens. The adapter ring screws on with a fluid action, thanks to the sturdy construction and aluminium screw thread. This is the non-wide angle ring adapter for the LEE100 holder, and is available in a variety of thread sizes to fit each of your lenses. Please check the thread size on the front of your lens before purchasing We know what it takes to produce precise, reliable, and repeatable results. Our continual investment in research and development allows us to embrace new technologies and adapt to the ever-changing needs of our customers. It's our ability to meet these needs that has kept us at the forefront of filter manufacturing in the UK for half a century