buy the biggest lens(ND FILTER) and convert your smaller lens to the biggest one (ND FILTERS) saving you a fortune in the longer run.
16/04/2021
These rings allow you to step up or step down the filter screw at the end of your lens, so that you can interchange filters for one size to anothe smaller of bigger one. Personally, in order to not end up with images that have circular borders, I would only work with 2mm differentials maximum on step down but if a larger filter should work OK on a smaller lens. Best advice is to try the various options with test images first in order to make sure.In use they are fine but take care not to over tighten or cross thread when fitting.
28/03/2021
With this range of rings which both setup of set down enable one filter to fit lenses with different diamentor threads
24/08/2020
I found that the rings are well made and the threads are well cut. I have had no problem with them so far.
15/08/2020