The REVORING from H&Y filters is an interesting concept. Instead of having to buy multiple step-up rings for all your different diameter lenses to use larger screw-on filters, you just buy one “variable” diameter REVORING that fits on a whole bunch of different filter diameter lenses. And you can attach and detach it much more quickly than a standard screw-on filter, too.
The system was first launched in June of last year with a VND + CPL combo. Now the company has just announced a new Black Mist filter, available in three strengths, that you can use either on its own or magnetically attach to your existing REVORING VND+CPL filters.