The B+W 43-52mm Step-Up Ring permits the use of 52mm threaded filters on lenses with 43mm filter threads. It features a lightweight, aluminum-alloy construction that has a corrosion-resistant, black anodized finish for durability. This step-up ring has side knurling to provide a more textured grip when mounting or removing it from a lens.
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Worked perfectly for my old pre-war Carl Zeiss Jena lenses
What a step up ring! How have I lived without this? I think I'll take it everywhere when I need to use a ND filter. I don't know how to use ND filters yet, I'm only on page three of the How To Be A Great Photographer by all the YouTubers but rest assured, when I get to page 56 I'll be rocking it.