No complaints - every photographer will point out the usefulness of a rectangular filter. But: I often take the camera with me on hikes. There the focus is on the hike, not the equipment. I don't have the time to use a rectangular filter and take the perfect filter photo. But the filter does what it's supposed to do: It fades out the overexposed sky so that the remaining colors of the picture don't drown in darkness. Without filter screwing - a real enrichment of the picture quality without wrong compromises and material battle. Clear recommendation!

These filters are undoubtedly of the best possible quality. Yes, they're expensive, but if you're serious about your landscape photography, these are essential. I've owned high end brands of resin filters before but they don't look at these. They have an anti-glare nano-coating with anti-fingerprint nano-coating. Overall a very good investment and I now have a complete and professional filtration system. If you're thinking of buying one (or a few) you won't be disappointed.

High-quality filters, great scope of delivery. (Packaged in a leather bag) I mainly photograph landscapes and I have to say that I don't want to work without these filters anymore. The transition (soft) is just really nice and gives the picture so much more structure. The workmanship is also very high quality and justifies the price. Keep it up!

The first test, screwing the adapter onto the lens, attaching the filter holder and fixing it, took a moment, but once you understand the principle, it's quick and easy. Putting the holder on the adapter is easier than with the systems I've known so far, the fact that you can fix the adapter is a plus on top. The CPL easily slips into the holder. The rotation of the filter afterwards also runs well and without it hanging or snagging anywhere. The rectangular filter sits firmly around the holder, but thanks to its frame it can be easily installed and removed. There is no comparison to the plastic holders that I have had so far, here I have a valuable filter set on my valuable lenses. But yes, the plastic holders that I had before were also cheaper, but you can tell by looking at them.

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.

All in all a good product. The quality seems good! Everything is made of metal and makes a robust impression. The adapter rings only have a thread, which I can screw onto my lens (in my case 49mm). If I want to mount a polarizing filter, etc., I first have to put the screw filter and then the adapter on top of it. What I also noticed is that the adapter ring sits very smoothly in the filter holder. It's almost like a steering wheel which you can easily turn several laps. A small rubber lip (on the adapter or on the holder) would possibly be a good product here!

I had never owned a K&F Concept filter before and was pleasantly surprised when I first used it in my landscape photography. The reverse graded ND filters of the popular brands of photo filters tend to be quite expensive and this one in particular is more affordable and achieves results that match and even better than the most reputable filter brands. It's made of glass, which is an advantage over resin filters as it doesn't scratch easily. I really liked the filter cover, which is made of leather with inner protection. In short, I really liked this filter and I am sure that I will use it very often in my landscape shots.

Scope of delivery:

- filter holder for 100mm x 100mm filter
- adapter ring 67mm
- adapter ring 72mm
- adapter ring 77mm
- adapter ring 82mm
- padded cardboard box for filter holder

The set makes a very valuable impression overall.
The adapter rings are made of black anodized aluminum - they are well made, not sharp-edged and the thread can be easily screwed onto lenses.
Apart from the filter inserts, which are made of plastic, the filter holder is also made of black anodized aluminum. Here, too, the processing is excellent. Maybe the quality of the plastic inserts could be a tick better, but that's already whining at the highest level. The inserts fit all 100mm x 100mm filters with a thickness of 1mm - 2mm.
packaging was impeccable; Adapters are individually wrapped; Filter holder is in a nice padded cardboard box.
Full points and recommendation for a perfect rectangular filter system at a significantly lower price than some other manufacturers.

The filter does what it is supposed to do, it extends the exposure time. I haven't noticed any vignetting or wrong color reproduction so far. And so I'm satisfied. The packaging of the filters is very good and practical, some higher-priced filters can't do that so well.

I 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 should hold my graduated filters after receipt, that I have from another manufacturer. 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,