Mattebox Clamp On Adapter Ring - Made custom for your lens size to eliminate glare and light spill, while still enabling the use of a circular filter on your lens. 
 
Easy to put on and take off /
Same high quality materials and high precision as our Follow Focus Rings - makes for a great fit. 
Much more affordable and universal than other options
Fully custom for your lens
 
If ordering the "Custom" variation, keep in mind you need to measure the front of the lens yourself. Filter size will not work!