Allows you to use smaller size filters on lenses with a larger diameter thread. The first number is the size that screws into the lens, the second number is the filter size. Step " Down" Rings May Cause Vignetting.
Reviewed by 1 customers
I use the adapter to attach a 52mm glass Solar filter to a DSLR 58mm lens. The adapter works fine for my purposes and saved the cost of a new Solar filter.