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 had been hesitating between several brands for a while to choose a filter holder for ND and GND filters. I took advantage of a flash sale to acquire this kit. I am not disappointed.
the set seems robust and easy to store.
The case, quite pretty, has 5 compartments, 3 of which, for square ND filters, can be lifted by means of a ribbon. On the back of the case, there is a ring to pass a strap and a passage for a belt. I would have liked a slightly more spacious compartment to house the adapter rings with the CPL filter when it is disassembled.
The assembly (or disassembly) of the elements is well explained in a manual in several languages, including French.

Main positives:
No color cast or loss of sharpness on the first tests carried out.
The plastic frame with its tabs to handle the ND filters.
The CPL filter installation system on the filter holder.
the knurled knob for mounting the adapter ring and the rotating block of the filter holder.
The very accessible wheel to control the polarizing filter.
Firm hold of the square filter on the filter holder.
The robustness of the metal filter holder.

If you have to find some negative points:
The slightly too vigorous maintenance of the square filter in the filter holder.
the click too hard to lock the CPL filter in the filter holder.
No pouch to independently protect the CPL filter in the case.
No CPL protective cover when the assembly is installed on the lens.

Although this is a low cost purchase for camera items, its worth the few bucks! This will be my 3rd lens protector in 20 years. and it just saved my lens once more.

The system is very well built and they sell frames to take advantage of other square filters you have from before.
It comes very well presented, in a case.

Unfortunately, the original box of the product comes with the Amazon label directly attached to it, and opened.
Very bad on the part of Amazon, which sometimes sends cardboard to wallpaper the house with an SD card, and in this case it is worth keeping the original box, they send it unwrapped