LEE Filters Adapter Ring for Canon 17mm TS-E Lens
The adapter ring is crucial to the LEE Filters system. It screws onto the cameraís lens and the Lee Filter holder is then secured to the adapter ring with the 3 part spring loaded brass wedge. It sits in front of the lensís front thread.
This special adapter ring allows more than half the movement that is normally possible with this lens before vignetting. Enables use of smaller 100mm system including the Big Stopper.