A good quality "square" filter system for photography. One thing to note if you are considering this system, the adapter ring kit does NOT come with a 55mm ring at this point. I raised the issue with K&F through their Facebook page and a response to that said the point would be shared with the appropriate people. Who knows, maybe it will come with a 55mm ring soon. If you need such an adapter for one of your lenses, you have to buy it separately. That means it's well made and sturdy enough to last for years I think and apart from 55mm there's a fair choice of adapter rings in the kit, eh

I like how they are easy to use and saves me time and frustration from having to switch lenses.
I do wish that I could use my K&F 150x100 square filter holder with this kit.
It’s unfortunate that K&F did not create this kit with the thought of using it with the square filter kit though.
I do use a UV and CPL circular filter with my square filter system at times and not to be able to connect my K&F 82mm filter holder ring with this is a bummer.
I’m surprised it doesn’t work with it or that it’s not able to screw onto the magnet filters in this kit.
K&F please fix that in the future.

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.

up until now, square filter holders from other companies have been expensive, and we have endured with SIOTI holders.
I also had an old K&F holder, but it is difficult to use C-PL.
That's where this product comes in. I bought a set of holder + C-PL + ND1000 for the time being, but it is well thought out. There is no vignetting even at 16mm with the Nikkor16-35mmF4, and there is no annoying color cast.
I'm a little worried about the C-PL's adjustment dial squeaking, but I have no complaints at this price with this content.
After that, I would like to see a frame that can be attached to the existing filters sold on the overseas official site, and a filter case that can hold about 6 to 8 filters with the frame attached.
~Addition~
I purchased a 100x150 frame from the US site of K&F. Existing filters can now be used, and full-scale operation is now possible.

Best quality filter I had in a while,

I like how they are easy to use and saves me time and frustration from having to switch lenses.I do wish that I could use my K&F 150x100 square filter holder with this kit.It’s unfortunate that K&F did not create this kit with the thought of using it with the square filter kit though.I do use a UV and CPL circular filter with my square filter system at times and not to be able to connect my K&F 82mm filter holder ring with this is a bummer.I’m surprised it doesn’t work with it or that it’s not able to screw onto the magnet filters in this kit.K&F please fix that in the future.

In addition to square filters, I have now also bought the cheap magnetic filter holder set. I can only say: great. A second glass-filled filter holder is included, which can be held up permanently with an adapter ring for a second lens size and still! In short: the article convinced me. would i recommend it Yes, everyone who wants to work with a neutral density filter from time to time.

Best Tripod out there.