I've used a handful of Cokin filters since the 80's. I just purchased the new Sigma 100-400 zoom for my Sony e-mount and I needed 67mm step-up ring for my filters. I also needed an 82mm ring for my wide-angle lens. I was about to buy two rings for more than this whole set costs. No brainer. Get this set for $60, use the two rings I need, and use whatever else I need out of this set. Other reviewers have said there are too many similar colored filters in the set. That may be true, but go through the set and pick out the ones that work for you. Put the rest and the other rings in your closet, you may use them one day. The four wallet-style filter holders can get bulky in your bag. I picked out a handful of filters that I need and put them in my Cokin filter box. I use one of the wallet-style holders for my step-up rings and the filter holders. The other three filter holders went into my closet. These filters will compliment my Cokin filters nicely. I think one reviewer said the ring wouldn't fit the lens; I haven't had that problem. All-in-all, this is a nice set, especially for beginners.