The Sensei PRO 39-58mm Aluminum Step-Up Ring permits the use of 58mm threaded filters on lenses with 39mm filter threads. It has large side knurls to provide a more textured grip when mounting or removing it from a lens. This step-up ring features a lightweight aluminum alloy construction with a corrosion-resistant, matte black, hard-anodized finish for durability and to minimize reflections.
| Compatible Lens | |
| Compatible Filter | |
| Ring Material | |
| Knurling |
| Package Weight | |
| Box Dimensions (LxWxH) |
I've got plenty of cheaper rings with no knurling. But once I discovered the Sensei Pro and how much easier they work in the field, I use nothing else. I use the aluminum version, under ten bucks and work just fine even with my Hoya HD3 ultra premium filters which are also aluminum. Sensei also makes a brass version for those with that more particular need for about double the price.
Works well.