Kase Wolverine Revolution Magnetic Step-Up Ring (72-82mm)

Of the many manufacturers of magnetic filters, only Kase (as far as I know) offers the inlaid rings, which nest inside the lens' filter threads, reducing the risk of vignetting when you stack filters. The only disadvantage is you need to use the provided tool to hold the ring for installation and removal.I bought this kit for 67mm, 72mm, and 77mm for a second benefit, to make it even easier to use my 82mm mag. filters with my smaller-diameter lenses. Installing the inlaid adapter lets me use the regular lens cap and hood until I need one of the filters. When I do, I can quickly attach the magnetic adapter (*different* from the regular screw-in adapters) to the inlaid adapter, then add filters.However, the lens caps for my Sony lenses no longer have enough filter thread to grasp. I bought separate magnetic caps for them (but see my review of those...). For my Sigma lenses, the regular lens caps still work fine.