Kase Revolution Ring: One 82mm Filter Mount for 67–82mm Threads

Kase's Revolution Ring is a variable step-up ring, priced at $70/£70, that fits lens threads from 67mm to 82mm and accepts 82mm screw-in filters plus Kase magnetic circular filters via an inlaid adapter. Spring-loaded buttons retract four claw grips for one-handed mounting. It also works with the Kase Armour 100mm filter system. The H&Y Revoring does the same job and has been around longer.