I've been using the product for about half a year now (almost daily) and I'm very satisfied with it!

Pro: The installation is easy and holds very well and with the installation rings it can also be used universally for any lens!
The filter also keeps its promises and the quality is still excellent!

Contra: the glass is a bit difficult to slide in, if you want to push the filter in, you should remove the attachment to avoid damaging the thread!

Conclusion: I am very satisfied with the product, even if you have to be a bit careful!
I give this product 8/10

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 when 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 label 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.

All in all, I'm very happy with the entire filter system from K&F and will probably get hold of the gradient filters soon!

Goods great, as usual from K&F Concept. Anyone who has worked with such a filter knows what quality they are holding in their hands. Filters are made of glass. I bought the rectangular filters, have a better grip and handling is easier. I gave up my attempts to work with (cheap) filter disks because they were not flat enough and contained inclusions.

I bought the gradient filter because it was recommended to me by friends.

After a few weeks of use I can say that I am more than satisfied with it.
When taking photos, it is necessary to darken the sky (e.g. at sunrise or sunset) in order not to get a burned-out sky or too dark a foreground.
This is where the filter shows its strengths. The filter can be positioned very easily in the appropriate holder without the risk of it slipping out. This gives you beautiful photos even with long exposures.

To expand, I will add more filters of this brand later.

I can make a clear purchase recommendation!

I love soft and diffused light in my photos. That's what the Black Diffusion Filter is made for, and it just does it. In connection with my favorite lens (18mm 1.4) just great. I have so much fun with the photos and also do some of my weeding shoots with this filter.

The light becomes much softer and more diffuse. In my opinion a really great effect. In addition, K&F can once again convince with workmanship and material. The filter can be easily screwed on and dismantled again. I haven't had any problems with step-up rings either.

I've attached two photos. Of course it's my own style, but you get an impression of how the filter works. A clear recommendation from my side.

The filter is well made and does exactly what a black diffusion filter should do. With a low price, it is particularly interesting to try out this type of filter, as it is more of a special filter.

Photographically, the filter reduces the contrasts and softens the highlights in the shadows. This creates a slightly softer image with a "dreamy" look. The effect is particularly evident with high contrasts, such as lighting at night. Attached is an example image with a chain of lights in the dark room. This clearly shows the effect. Recordings at night with individual light sources (e.g. car headlights) are the primary use cases for me. Personally, I see more added value in videography for the filter to create a cinematic look.

Of course, in preparation for our round trip, we also needed a good filter system. We spent months reading, getting information, watching and comparing videos. In the end we decided on this system. And that was a great decision! There are definitely better systems out there, but also for a lot more money. Everyone has to decide for themselves whether a hobby photographer really needs it. With this system, we are talking about real glass - not plastic! The glass is not colored but coated, so there are no distortions or blurring at the edges. The only drawback is that the glasses are quite difficult to slide into the holder - BUT nothing slips out and nothing slips. Perfect for quick position changes. We got used to it quickly. The results with the filter are as desired, there is nothing to complain about. We are thrilled and would choose this filter system again and again. We bought the kit with the holder including all adapter rings, the graduated filters, the 64 and the 1000 - everything was great! Have fun capturing memories!

I bought the filter holder system together. The adapter rings cover all possible lens diameters, are made of metal and fit perfectly. Because of the tight mechanics on the right, I always equip the actual filter holder with plug-in shafts for a maximum of 2 filters before locking it on the adapter ring, which is less fiddly. The holder can be easily rotated so that it can be slanted, but it holds well and does not slip further by itself. The filter itself is also very secure and has to be pushed with force, which, however, secures it against falling. At the price maximum purchase recommendation!

Came in quality packaging. Adapter rings were in individual bags but don’t see that as a drawback.

Hoping the glass is a better choice than resins that scratch...will just need to be careful not to drop them.

Needed a 10 stop Nd filter for long exposure and decided after reading reviews to buy this bundle instead of buying a smaller cokin p size to go with and older format Hi-Tech system I have. So glad I did.

I LOVE how easy this is to attach to the lens. I need to take more shots...but so far I am not getting any color cast. I shoot raw anyway so it isn’t a deal breaker. I LOVE the glass. Because the set screw was a bit fussy on my Hi-Tech holder, I opted most times not to carry it with me. I would rather fuss with composition and camera settings than fuss with a filter holder. This one will be in my bag from now on for sure. It’s simple to set up in the field.

Update 10/12/19. Put this set thru it’s paces on a photo shoot in Hawaii. Professional photographer was impressed with the 10 stop glass. No color cast. Easy to use. Got the 6 stop and 10 stop glass. Highly recommend both. I just need to get a 3stop to complete my set.

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 comes 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.