Since I have not yet worked with ND filters, but I do not know what I could complain here.
Overall, I am very satisfied with the glasses from K&F. You get a high-quality, processed filter with a top optical quality and a good scope of delivery (leatherette case).

I had never owned a K&F Concept brand filter before and was pleasantly surprised when I first used it in my landscape photography. The reverse graduated ND filters from the popular brands of photographic filters tend to be quite expensive, and this one in particular is less expensive and produces results equal to and even better than those of the most reputable filter brands. It is made of glass, which is an advantage over resin filters because it does not scratch as easily. I really liked the filter cover, which is made of leather with interior protection. In short, I liked this filter very much and I am sure that I will use it very often in my landscape photography.

I bought the graduated filter because it was recommended to me by acquaintances.

For this price top！！！

received the new X-PRO filter set today and have already tested its applicability in the apartment. I'll give you a verdict on the quality of the filter glasses and how they can be combined in one shot... The box supplied holds the holder + adapter rings + CPL + ND 8/64/1000. You can pull out the compartments on the drawstring and then remove the filters very easily. The plastic filter frames are discreetly sharp-edged, but not uncomfortable, and allow the filter to be removed and handled without having to touch the glass. Thanks to the tabs on the frame, the filters can also be pulled out of the holder very easily, especially in any order. I ordered two empty frames in 100 X 150 from the manufacturer's website, which are supposed to hold my graduated filters, which I have from another manufacturer, upon receipt. I'm curious how well this works. If it works, then I have a complete system for myself, with CPL, three ND filters and two graduated filters (Soft 0.9 and Reverse Soft 0.9). Sliding the filters in and out of the holder requires some force, but isn't awkward or imprecise. In this way, the graduated filter will also be easy to align. The handling of the CPL filter with the insert bracket is great, the turning mechanism is a bit rough, but precise. Screwing the adapter rings onto the lens works very well, the threads are cleanly worked, so nothing rubs. Attaching the holder to the adapter ring is also a joy and the presence of a set screw is very welcome as the holder rotates on the ring with relative ease. The handling of the system has already convinced me, I can live well with "only" two slots for my needs and I'm looking forward to the first use, in the next few days, in the great outdoors and with cold fingers. So far I've worked with round screw filters and dispensed with gradient filters, which I would like to change now. I also looked at the system from Rollei (Mark II), which cannot keep up with the handling of the X-PRO from K+F. Everything is very flat and fiddly, offers hardly any contact surface for holding and assembling the parts. Getting the polarizing filter or adapter ring out of the holder is no fun and almost impossible with cold fingers. K&F solved this much better. If you want to use gradient filters, the X-PRO set is a good choice. If you only need gray filters, I would recommend a magnetic round filter set with a diameter that is significantly larger than your largest lens, which is even faster to use, is more compact and should then do not darken with several filters in parallel.

Good Product and reliable one

I wanted a filter holder with these characteristics and an ND filter to start my first steps in long exposure photography. I chose this brand as I usually like what it offers (and quite adapted especially for the price it offers) A sturdy metal filter holder with safety trigger to put on the adapters and an ND 1000 filter that fits perfectly is to start with this type of photos even with light see in the photos, it comes with a faux leather cover with a soft velvety interior so that the glass and the filter holder do not suffer any damage, although it is presented in the box without a cover.

I'm amazed by the quality, everything you need is there and for the price it's great. The only drawback is that the filter holder sits a little loosely on the adapter ring, but that's complaining at the highest level. The moss lip on the ring gets an extra plus point, so no light can enter from the side. The function is given, which would be nice to have an additional slot for a third filter that you can screw on if necessary

Excellent!

The buckle mount of the adapter ring is very stable. It is great!