Last fall I did a fairly comprehensive test of the different UV filters I have. Until just before then, all of the filters I've used were mainly from Germany, with a few Japanese companies also represented. I'd become used to what "good" filters cost, and given how expensive many of my lenses are, and that I mainly photograph out on hikes, etc. (and have severely damaged several filters, while leaving the lenses they were on un-touched)—it's a price I've been willing to pay. But, I had just gotten a new $2500 lens in that was bundled with a Chinese sourced filter, and had also decided to buy a K&F Nano series, due to a friend's recommendation. The test kind of shocked me—both Chinese sourced filters came out in the top tier of the test (along with a Japanese brand). In all fairness, although all filters I tested were multi-coated, my most recent filter (beyond the 2 new ones that were in the test) were at least 8 years old, and there had has been a LOT of progress in multi coating technologies. In any case, I've been buying K&F—UV, polarizers, and ND filters, since then. This is my latest addition, and no—I'm not planning on testing how "explosion proof" the filter is. I was curious if there was any optical degradation over the same series K&F "non explosion proof" filter—after all, I'm pretty sure that the glass in this is laminated, to make it so strong—but, in looking at 100% sized images from 102 MP shots, I don't see any real differences. (Yes—no filter at all does retain a slight advantage to even the best of the filters I've tested.) While these are aluminum rings (K&F makes a line higher than this, with more layers and brass rings) the rings thread smoothly, and I really like the machined knurls that make screwing it on and off easier.