The Sensei PRO 40.5-77mm Aluminum Step-Up Ring permits the use of 77mm threaded filters on lenses with 40.5mm 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.
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