The Sensei 52-77mm Aluminum Step-Up Ring permits the use of 77mm threaded filters on lenses with 52mm filter threads. It features a lightweight, aluminum alloy construction that has a corrosion-resistant, black anodized finish for durability.
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I held off for entirely too long on using ND filters because the thought of having to lock myself down to a specific lens to use it (or the thought of getting multiple cheaper filters) was just awful. I'm honestly not sure why I didn't think of looking for a step-up kit earlier, I knew they existed, there was just some kind of brain disconnect I guess. Anyway, I finally purchased a single really good ND filter, and these rings cover me for all the lenses I have. I added a nisi filter case to keep the rings and the ND filter in which makes it such an easy thing to pull out, quickly find the ring I need, then screw the ND on quickly. Love these!!
It is exactly as advertised, and works great!