These filters are an absolute highlight, convincingly good quality, everything fits perfectly, everything is high-quality and securely packaged and safely protected for transport in beautiful cases.

I got this for the filter holder and adapters. They work great!
Mad the filter that came with it is pretty decent.

Does what it's supposed to do... and very well made

Excellent value for money. Well though out, made and engineered, comes in a nice box, all very well presented. Complete with adaptor rings to fit most lenses. No colour cast that I can see. Im very pleased with the filter kit and have produced good images. Would recommend K&F Concept Pro Square filter set to anyone not prepared to pay silly money for other brands.

It's been a while since I hesitated between several brands to choose a filter holder for ND and GND filters. I took advantage of a flash sale to purchase this kit. I'm not disappointed. The whole thing seems sturdy and easy to store. The case, quite pretty, has 5 compartments, 3 of which, for square ND filters, can be lifted using a ribbon. On the back of the case, there is a ring for passing a strap and a belt loop. I would have liked a slightly more spacious compartment to accommodate the adapter rings with the CPL filter when it is disassembled. The assembly (or disassembly) of the elements is well explained in instructions in several languages, including French. Main positive points: No color cast, nor loss of sharpness on the first tests carried out. The plastic frame with its tabs for handling the ND filters. The system for placing the CPL filter on the filter holder. The knurled button for mounting the adapter ring and rotating the filter holder. The very accessible wheel to control the polarizing filter. The vigorous holding of the square filter on the filter holder. The robustness of the metal filter holder. If we have to find some slightly negative points: Holding the square filter a little too vigorously in the filter holder. The click too strong to lock the CPL filter in the filter holder. No pouch to independently protect the CPL filter in the case.No protective cover for the CPL when the assembly is installed on the lens.

Works great on my Nikon Z6 16-30

Super easy to handle. Comes in an included bag. Quality is mega. Haven't regretted the purchase. It's fun and the pictures from the camera are very nice. Best regards ✌️

When you get used to it it great but sometimes you cant lock it onto the lens adapter and the whole thing spins

Perfect product that adapts really well to all lenses! This allows you to have only one support. Very good quality with the storage pouch. I had lost a screw and the after-sales service was very responsive and they sent me back a batch of screws.

Everything is as described.