Since there are no actual reviews of this filter yet (Sept. 2022), I'll chime in briefly to say I just got it and it looks very well made, the glass looks great and the soft edge good to my eye. Have not had a chance to try it in the field yet, but will report any issues if any. Based on appearances, I'm giving it 5 stars for now, subject to field use. This was the only filter I found anywhere near this price range that has 4-stops of graduated neutral density. I find that the more common 3x is not enough at times. Although it's called part of a "square filter system" on the box and in the manual or product guide, this is in fact a standard 100x150mm RECTANGULAR filter. The manual is in several languages; the English part is written in better-than-average English with pretty good descriptions of other products available from this company. The weird thing is the box it came in, which is somewhat over-engineered with a magnetic clasp. But better than a cheapo box I guess. The actual filter "pouch" or rigid envelope containing the filter, within that box, looks like something jewelry might come in, or a fancy wallet perhaps. It looks like real leather (may not be but well done) in brown and gray tones, with an orange tab you pull to get the filter out of it. More magnets holding the clasp closed. Nice but probably added 15% to the cost and a little too much for my bag but you may like it for yours. I stuck the filter in my filter holding box in my camera bag where I can access it more quickly as the sun goes down.

Great neutral density filter. Great value for money.

One of the best filters, unbeatable value for money...

About the filters (ND 64 + ND1000):
Perfect quality, no color cast. The leather cases are sturdy and protect the filter plates.
Of course, I didn't want to test their scratch resistance, but it should be many times better than plastic filters.
The sharpness is not affected.
The filters fit very well in the holder.

The holder is sturdy and can be removed very quickly thanks to the push button, which can be helpful if you want to double-check the focus, for example.
I also like that it has two slots instead of three, so it doesn't take up too much space. This could otherwise be a problem with very wide-angle shots.
A big plus because all ring sizes are included, and you don't have to buy each ring separately...

I haven't had the change to do real world testing yet but I've taken a few test shots in my garden to check for loss of sharpness and color casting. I used a macro lens for checking fine detail and wide angle to see if its consistent across the frame. I also checked it against my Lee Filters big stopper.

I couldn't find any percievable loss of sharpness across the entire frame with the macro or wide angle.

There is a bit of a color cast to it from looking at the exif data but shooting in raw the camera adjusted it out for the most part and can be edited out manually if required. Importantly though it seems to be consistent across the entire frame, even at 10mm on my apsc sensor.

I did experience vinetting on the wide angle (both 10mm and 22mm) but again it can be edited out very quickly in lightroom.

It would have been nice if it came with a light gasket supplied with it but for the massive price difference compared to the bigger brands I can forgive them for that. They can be purchased online elsewhere if required which is what I'll be doing.

Overall I'm pretty happy with it, which is just as well really as it managed the slip through my Lee Filters folder when I wasn't paying attention and drop onto the paving slabs in my garden, which chipped the corners of the glass. That's my own fault though as it's a known issue I have with the holder, I experience the same problem with my Nisi filters in my holder so I think it's a bit worn out.

..works perfectly with the K&F filters. Great value for money! Would buy again.

Scope of delivery:

- ND64 filter 100mm x 100mm
- Synthetic leather case for 100mm filter
- Padded cardboard box for filter case

Very high-quality 100mm x 100mm ND64 filter with a measured thickness of 1.85mm.
The images look very promising even with sharp fixed focal lengths – it's a pleasure to shoot with. I don't notice any reduction in quality due to the filter.
The extremely attractive and high-quality packaging is also worth mentioning. It comes in a synthetic leather case lined with fine fabric on the inside and has two magnetic snaps. This case, in turn, is housed in a beautiful padded cardboard box.
I haven't worked with ND filters before, but I don't know what I could complain about. The price is also extremely fair in comparison. Therefore, I give it full marks and recommend it.

Tuff. Works well. Cuts out Infrared which makes it better than the cheap versions and giving you a better photo.

This is my first ND filter, and I'm completely satisfied.

It darkens the scene by 10 stops, allowing you to comfortably take long-exposure photographs in full daylight. It's made of glass and looks good quality.

I've used it with my Sony A6000 and haven't noticed any noticeable cast or aberration.

It comes with a leather case, lined inside with a soft, velvet-like fabric, which is great for transporting it without fear of scratching.

An indispensable filter for landscape and sunset. High optical quality. The protective cover is fantastic.