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.

I mounted the kit on a lens with the 72 mm ring and it fits perfectly. It's easy to assemble and its operation is very simple, it doesn't require reading the instructions (I'd say it's better not to read them) just seeing the illustrations is enough. As for the quality of the product, it seems to be made with good materials and the finish is excellent; the polarizing filter holder is very effective, placing the filter well and with care and you don't touch it at all. There are two compartments for the square filters that I hope to get the most out of, I'm happy.
As for the optical quality of the filters, I can't comment because I haven't used them yet.

This time I give 5 stars congratulations the price cheaper than the official quote K&f Concept

This has been a good kit and is nicely made. Thumb screw to lock on to lens ring is a bit poor. Threads are not smooth, therefore difficult to tighten and undo. Although the filter box is extremely well made, it is very heavy and I am looking for an alternative.

Delivery time was faster than I expected, received them after a week from New Zealand. I love the packing style which brings to customers a professional attitude. Thank you for that and I will buy more products later on. :D

Premium features, specs and packaging for a really competitive price.

This filter set is exactly what I was looking for. No plastic or light leaks here. It's very well manufactured and packaged. All light weight aircraft aluminum and optical glass. No color distortion in the filters. Everything fits nice and snug. If it didn't, then you would be inviting light leaks. Some reviewers said the fit was too tight. Not mine, it was perfect. Looking forward to using these on a daily basis. Great job K&F.