Everything is as described.

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.

Very good product quality Fully meets my expectations. The only small downside is that the filter holder is not compatible with 100 mm filters from the same brand. It's petty, especially at the price of the baby.

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.

The quality of the manufacturing or the accuracy of the details and the attention to everything, big and small, my friend. Make sure that you have missed out on a lot of quality and savings with the final solution. One filter for all your lenses.