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.

I am very impressed. The package arrived on time very safely and securely packed, well done. The system fitted my 82mm lens front and was very simple to set up and operate.
I look forward to many hours of positive photography using this excellent system.

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.

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.

Among several domestic and foreign companies offering square filters, I decided on this one because it is easy to put on and take off from the lens, it is thin in the front and back, and it comes with a C-PL filter
For C-PL filters, just open the lid and drop in from above. If you make a mistake in front and back, it will not fit.
The square filter has just the right amount of friction and doesn't feel like it's going to fall off.
Almost all metal, except for the four metal adapter rings and C-PL filter, the holder alone weighs 110g.
In terms of design, the overall impression is sophisticated.

After many reviews that I looked at on Youtube, I decided on the new K&F filter holder and have not regretted it so far. It is easy to use and makes a very high-quality impression. The use of the CPL filter is a great solution. Lever up, put it in and lever down again, done. Adjusting the wheel is also buttery smooth. In contrast to the first K&F filter holder, the filters, which now have a frame, can now be pushed in very easily. Not too easy and not too heavy either. A clear buy recommendation.

Had screw-on filters for years. Of course they work, but a plug-in filter is really practical, especially for landscape photography. I first bought the filter plug-in system from K&F (Nano x per row). Now have some filters. Filter and plug-in system highly recommended. I'm really excited. Goes fast, good quality and you can also leave filters on if you want to go a few steps further. I also like the frame around the filter. That way, greasy fingers don't get on the filter so quickly. Nothing wobbles. There is also a stylish filter bag.

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.