I purchased the rectangular filter set directly from K&F.
Since I have worked with screw-in filters in the past and had the problem of vignetting when screwing multiple filters on top of each other, I have long wanted to purchase a set of rectangular filters.
Since sets from NISI, Haida and other well-known manufacturers are very, very expensive, as an amateur photographer I was looking for a cheaper alternative.
When I saw several reviews on YouTube, I opted for the K&F set, which is half the price of Haida and CO.
I absolutely do not regret my decision.

The filter holder is very nice and well thought out.
I particularly like the way the polarizing filter is attached to the holder and how it can be adjusted using the little dial.
The filters themselves are made of optical glass and have no color cast and are also well coated.
Another positive aspect is that the filters have a plastic frame with a tab.
This allows filters to be inserted and removed without annoying fingerprints.
A bag is included to store and transport the support and the filters it contains.
Also included are various adapter rings for different filter thread diameters.
As an amateur landscape photographer, I no longer want to do without the advantages over screw-in filters.

I give a clear purchase recommendation for amateur photographers and professionals too!
I didn't expect such excellent quality for this price.
It's crazy what K&F offers here.

Box contents:

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

The whole thing makes a very valuable impression overall.
The adapter rings are black anodized aluminum - they are well made, not sharp and the thread can be easily screwed onto the lenses.
In addition to the plastic filter cartridges, the filter holder is also made of black anodized aluminum. Here too, the treatment is excellent. Maybe the quality of the plastic inserts could be better, but this is already complaining at the highest level. The inserts fit all 100mm x 100mm filters with a thickness of 1mm to 2mm.
the packaging was impeccable; Adapters are individually packaged; The portafilter comes 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.

After many reviews that I saw on Youtube, I decided on the new K&F portafilter and I haven't regretted it so far. It is easy to use and gives a very high quality print. Using the CPL filter is an excellent solution. Raise the lever, put it in and bring the lever back down, done. The wheel adjustment is also smooth. Unlike the first K&F filter holder, the filters, which now have a frame, can now be inserted very easily. Not too easy and not too heavy either. A clear purchase recommendation.

So far no light has come out. I like the frames to get 100x100 and 150x100 for my additional filters. It keeps fingerprints out of the filter.

The company is based in Hong Kong. I would have liked to have additional adapter rings, but K&F Concept doesn't sell them separately it seems. I contacted her through her website/email and continue to receive ads for her backpack. I have been asked to get magnetic adapter rings which will not work with this system. It looks like if you want to get adapters you need to purchase the portafilter and adapter rings.

This is definitely a product to buy. I can't wait to take photos with it. It would be nice to have a wide angle lens hood.

The kit is excellent and fulfill all my needs. Also the delivery time and presentation was excellent.
Very happy with the purchase.

I have been doing landscape photography as a hobby for many years. I used circular filters throughout that time. I had some gift cards and decided to try the square and rectangular filter system. This one was the affordable option. I am happy with the quality of this product. It seems to perform well so far in some of my trials. I will say that the only problem so far has been the carrying case magnetic latch. DO NOT TRUST IT. It will come open if you turn the case upside down. I would rather have had some kind of clip latch or something that is less likely to fail.

I bought the rectangular filter set directly from K&F.
Since I have worked with screw filters in the past and got the problem with vignetting when screwing several filters on top of each other, I have wanted to buy a rectangular filter set for a long time.
Since the sets from NISI, Haida and other well-known manufacturers are very, very expensive, as a hobby photographer I was looking for a cheaper alternative.
When I saw several reviews on YouTube, I decided on the K&F set, which is half the price of Haida and CO.
I have absolutely no regrets about my decision.

The filter holder is very valuable and well thought out.
I particularly like how the polarizing filter is attached to the holder and how it can be adjusted using the small wheel.
The filters themselves are made of optical glass and show no color cast and are also well coated.
Another positive aspect is that the filters have a plastic frame with a tab.
This allows the filters to be inserted and removed without annoying fingerprints.
A bag is included to store and transport the holder and the filters in it.
Also included are various adapter rings for different filter thread diameters.
As a landscape hobby photographer, I no longer want to do without the advantages over screw-on filters.

I give a clear purchase recommendation for amateur photographers and professionals too!
I wasn't expecting such excellent quality for this price.
It's amazing what K&F delivers here.

I received the new X-PRO filter set today and have already tested its applicability in the apartment. A judgment on the quality of the filter glasses and the combinability in a shot I still deliver ... The supplied box holds the holder + adapter rings + CPL + ND 8/64/1000. At the drawstring you can pull out the compartments and then very conveniently remove the filters. The plastic filter frames are decently sharp-edged, but not unpleasantly so, and allow you to remove and handle the filter without having to touch the glass. The tabs on the frame also make it very convenient to pull the filters back out of the holder, especially in any order. I have ordered two empty frames in 100 X 150 on the manufacturer's site, which should take my graduated filters after receipt, which I have from another manufacturer. I am curious how well this will work. If it works out, I'll 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 is neither awkward nor imprecise. This will then also allow the graduated filter to be aligned well. The handling of the CPL filter with the insertion bracket is great, the turning mechanism is a bit rough, but precise. Screwing the adapter rings onto the lens goes very well, the threads are cleanly made, nothing rubs. Attaching the holder to the adapter ring is also a pleasure and the existing locking screw is very welcome, as the holder can be rotated relatively easily on the ring. The handling of the system has already convinced me, with "only" two slots I can live well for my needs and I look forward to the first use, in the next few days, in the great outdoors and with cold fingers. I have so far worked with round screw filters and waived graduated filters, which I now want to change. I also looked at the system from Rollei (Mark II), which can not keep up with the X-PRO from K+F in handling. Everything very flat and fiddly, offers little surface for holding and joining the parts. Getting the polarizing filter or adapter ring out of the holder again is no fun and almost impossible with cold fingers. K&F has solved this much better. Who wants to use graduated filters is very well served with the X-PRO set, who only needs gray filters, I would advise a magnetic round filter set, whose diameter is well above its largest lens, which is even faster to use, is more compact and should then not darken with several filters in parallel.

Super price performance!

I loved the quality of the materials, all metallic. I looked at many kits but they were all plastic and this one caught my attention especially from the comments. The truth is that it was a success because any other similar kit does not fall under 300€.The optical filter nd1000 is made of glass and gives a very good quality. The only thing I noticed is that it loses a little saturation and the white balance is a little bluish, but when processing the RAW it is easily fixed. You increase the color temperature and saturation and you are done!!! (I use a Canon 80d + 16-35 f4 is). I imagine each lens will be different.Attached a few photos so you can see the difference with filter and without filter. Exposure time on the photo with the 30" filter.If you want to start in the world of filters, do not even think about it for this price. Excellent results.