ND filters are essential for some types of photography, such as moving vane effects - and as I suspect I am exaggerating litt.... And of course there are millions to buy and a huge range of costs. I've tried lots from super cheap kinesium resin to some anstendig quality, and reach this. First and foremost is optical glass. And that makes a difference because the resin type, while not bad if you treat it with extreme care, tends to rip easily, and of course the optical quality regardless of what the text says is not nearly as good as anstendig glass. On the other hand, it is very well made. I mean up there with the silly prices well made as I have tried and used in a well known camera store. This is a true 100% premium set considering the production standard and the overall feel of it. Smooth in action with perfect optical clarity across the density range. In use it is super simple. Fit - which is smoothly given to the well-made thread and then rotates the outer ring to the desired level of darkness. It saves a lot of time with different filters or stacking of them. Frankly, if you want a good selection of ND filters (not outdoors of course), this is a good choice. I used it on my Zeis Batis lens, and it worked a treat.