To the filters
Perfect quality, no color cast. The leather bags are stable and protect the filter plates.
Of course, I didn't want to test scratch resistance, but it should be many times better than with plastic filters.
The sharpness is not affected.
The filters fit very well in the holder.
The holder is stable and can be removed very quickly thanks to the pusher with which it can be removed, which can be helpful if you want to check the focus again, for example.
Big +, because all ring sizes are included and not every ring has to be bought...

I bought the filter bag to have all the filters at hand more quickly and not to have to search for them, and to save space. The bag is of high quality and fits perfectly for 100x100mm filters. A total of three (theoretically four) different filters can be stowed in it. So it is perfect for a standard ND filter set (8,64,1000).

The inside of the bag is completely lined with microfiber so that the filters can be transported in it without additional protection. As a smart feature, it has a pull-out mechanism. This means that if you open the bag and pull the tab, all the filters are offset and highlighted so that you can grab them much better and read the name directly.

I bought another glass filter at the same time - ND64. Since I already own an ND8 from another brand and the ND1000 from K&F, this was of course still missing in the series. Overall, I am super satisfied with the quality of K&F. The filters (update 2020) have almost no color cast anymore. In certain light situations, my ND64 filter turns green. However, this can be corrected without major problems during image processing. The shape of the filter (no round filter) also means that there are no problems with vignetting or falling sharpness. The images are therefore almost unaffected in terms of image quality. The processing is top (no sharp edges, stains, etc.) and the price speaks for itself.

I like the quality of the materials. They're all metal. I have seen many kits but they are all plastic especially this one because the comments caught my attention.
The filter is made of glass and the quality is very good. The only thing I noticed is that it loses a bit of saturation and the white balance is a bit bluish, but it's easily remedied when processing RAW. They increase color temperature and saturation.
If you want to enter the world of filters for this price, please don't think about it. Excellent results.

Overall, the set makes a very valuable impression.
The adapter rings are made of black anodized aluminum - they are well made, not sharp-edged and the thread can be easily screwed onto lenses.
Apart from the filter inserts, which are made of plastic, the filter holder is also made of black anodized aluminum. Here, too, the processing is excellent. Maybe the quality of the plastic inserts could be a tick better, but that's already whining at the highest level.
packaging was impeccable; Adapters are individually wrapped; Filter holder is in a nice padded cardboard box.

I was looking for a rectangular filter holder for a long time and after a long search I found what I was looking for from this supplier.

The holder is supplied with 7 adapter rings and can therefore be attached to different lens diameters.

The adapter ring is screwed onto the lens thread and the holder is simply mounted on the ring.
The mount holds securely and doesn't give me any concerns that it might not hold, even with minimal play.

The item reached me very quickly and was packaged very securely! The filters and the brackets were once again housed in very high-quality boxes. In addition, each filter is still in a leather case.
So far I'm very pleasantly surprised!
I can't make any statements about usage yet. I will revisit this at a later date.

After a long research and many comparisons, I decided on this filter.

The decisive factor for me was the price / performance ratio, which I think fits very well.

The filter is top processed, without a visible color cast and just does exactly what it is supposed to.

It helps to extend the exposure time slightly or, in bright sunshine, makes it possible to take pictures with an open aperture.

Well, this ND filter had been on my mind for a long time, now I've struck. I am finally equipped with an official 64 ND filter for my matte box, which takes it really seriously. Color impairments or other faulty things are far from any question here! Optimum quality with really usable basic elements of the actual design are perfectly matched here!
I need more light filtering - here it is!

Very good quality ND1000 K&F Concept Filter, including glass filter, filter holder and lens adapter for the filter holder.
Since we have a variety of different diameters, the adapter ring allows us to put the filter holder on any lens. They are ferrous metals and well made. Each ring has an inscription of the corresponding diameter.
The filter is housed in a leather case with a thin piece of paper inside. The shell is strong enough to protect them properly.
With its price, it's a great filter to experiment with and get excellent results. I'm really happy and enjoying it a lot. I recommend it to you!

It's my first ND filter and I'm totally satisfied, it's made of glass and looks high quality.

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

It comes with a leather sheath lined with a soft fabric inside; Velvet type, practical to be able to transport it without fear of scratches.