This is a very versatile system and a quality product. The tabbed filters slide in and out of the holder without difficulty. So far, no light leaks. I love the ability to get frames for my additional filters, 100X100 and 150X100. It keeps fingerprints off the filter.

The company is based out of Hong Kong. I would have liked to get additional adapter rings, but the company does not sell them separately, or so it seems. I've contacted them via their web site/email address and keep getting ads for their backpack. I was referred to get magnetic adapter rings which are not for this system. It appears if you want to get adapters you need to buy the filter holder and adapter rings.

This is definitely a product to purchase. I look forward to shooting pictures with it. It would be nice to have a wide angle lens shade, but then, you can't always get what you want.

I bought the rectangular filter set directly from K&F.
Since I worked with screw filters in the past and had the problem with vignetting when screwing several filters on top of each other, I 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, I was looking for a cheaper alternative as a hobby photographer.
When I saw several reviews on YouTube, my decision on the set from K&F which is half cheaper than that of Haida and CO.
I have absolutely no regrets about my decision so far.

The filter holder is very high-quality 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.
It should also be positively emphasized that the filters are provided with a plastic frame with a tab.
This allows the filters to be inserted and removed without annoying fingerprints.
It comes with a bag to store and transport the holder and filters in it.
Various adapter rings for different filter thread diameters are also included.
As a landscape amateur photographer, I no longer want to miss out on the advantages compared to screw filters.

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

The system with the CPL filter mount beats anything I've used before. The mounting of the bracket is also easy by hand. The quality of the filters themselves leaves nothing to be desired. This makes filter photography simply fun!

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

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

K&F Concept Square System Filters Kit is a very versatile system and a quality product. The tab filters slide in and out of the holder with ease. So far no light has leaked out. I love that frame for my additional 100 x 100 and 150 x 100 filters get. It keeps fingerprints off the filter.

The company is located in Hong Kong. I would have liked to get extra adapter rings, but K&F Concept doesn't sell them separately, or so it seems. I contacted them through their website/email address and keep getting ads for their backpack. I was directed to get magnetic adapter rings, which are not for this system. It seems if you want to get adapters, you have to buy the filter holder and adapter rings.

This is definitely a product to buy. I look forward to taking pictures with it. It would be nice to have a wide angle sunshade.

After many reviews I have watched on YouTube, I have decided for the new K&F filter holder and so far not regretted. It can be operated top and makes a very high-quality impression. The use of the CPL filter is great solved. Lever up, put in and lever down again, ready. The adjustment via the wheel is also smooth as butter. In contrast to the first K&F filter holder, the filters, which now have a frame, can now be inserted very well. Not too light and also not too heavy. A clear buy recommendation.

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 was very surprised and pleased with the quality and clarity of the Graduated Neutral Density filter. My only concern was the filter fit tighter than i thought necessary and I was afraid I might break it trying to insert it into the filter frame. A little lithium lube in the grooves of the frame helped. I’ve included two test photos I shot to show the effect of the filter. Obviously the one with the darker sky was the one with the filter while the other had no filter.

I bought the rectangular filter set directly from K&F. Since I have worked with screw filters in the past and had 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.

Really cool filters, it really is a lot easier & quicker to drop in a filter as opposed to unscrewing one. Would have been cool & funny if you would have started the broadcast with a filter already on the camera.