It works fine and I like it!

82mm used on Nikon 24-70 F2.8, now have the 77mm for 70-200 F2.8, may try a 52mm to see if it will fit a 300mm F2.8 drop in, allowed me to shoot the Lancaster on a bright day at F6.3 (sweet spot) iso64 at 1/6th second to obtain perfect full discsCracking filter fully recommend

This ND filter maintains the sharpness of the image to an acceptable level, in my humble opinion. There is some colour cast and vignetting, which can be adjusted in post, so it's not that big an issue. The build quality is decent, and it's very easy to clean.The ND8-ND128 is a good range that is suitable for most conditions, both for photography and videography. If you're trying to take long exposure shots in very bright sunlight, you will definitely need an ND filter with at least 10 stops (ND1000 or more).Overall, I'm satisfied with the purchase. It's definitely worth the money.

I can highly recommend this article. The delivery was really fast. The first view was nice, because it looks quite strong and it feels that I will not break so fast. Which is good because I take most of my picture while I am hiking.

This filter is really good also for filming and long exposures, so I don't have to change filters. I can use this one for many different situations. The prize is also really good and in the postproduction I saw no problem while I was editing in lightroom.

So if you want to have a good filter which is not to expensive then this is a good is good choice!

Did my first shoot using the K&B nd filter and what a differeence. The colors are more vivid. This variable filter works so well I;m just speechless. No X pattern as advertised. Super pleased with my choice.

I've tested some cheap variable ND filters and this one is by far the best for this really small price. The main feature is that this filter really does not deliver any cross image errors, unfortunately this is a problem that all cheap filters have but the one from K&F delivers a flawless image! The color shift is also only minimal and provides decent sharpness! I use this filter on a BMPCC 6K to shoot in daylight with the aperture completely open. If you can't spend more than 100 € on a good filter, this is pretty good for you.

Der Filter tut einfach, was er soll. Die Verarbeitung ist tadellos. Ich hatte bis jetzt ND Filter von Hama, Hoya und Walimex. Farbneutral war keiner. Dies ist mein erster variabler. Er macht das Bild etwas wärmer und gefällt mir am besten. Der Farbton bleibt auch bei allen Einstellungen gleich. Getestet mit Sony a7III. Ob der Weißabgleich bei anderen Herstellern das gleiche Ergebnis liefert, kann ich nicht sagen. Die Belichtungsmessung muß ich +1 korrigieren, um ein gleich hell belichtetes Bild zu erhalten. Die beigefügten Bilder sind in LR identisch entwickelt. Auch bei 24mm habe ich kein dunkles X. Die Schärfe leidet auch nicht.

I've been looking for a decent Variable ND Filter for some time now and stumbled across this one from K&F.Having recently purchased a new backpack from the brand and being impressed with the quality, I thought I'd treat myself to this filter. After all it claims to not have the dreaded X that almost all Variable ND Filters have.On first impressions the filter was packaged very well in a hard branded card box. Inside was a plastic clamshell style case, housing the filter safely in a foam material.Getting my hands on the filter, I was amazed with the built quality and overall feel for the price! It feels well put together and durable.Having only briefly tried it on the Canon 80D paired with the EF-S 17-55mm f2.8, there is a small amount of vignetting at 17mm. However this disappears as you zoom in. (The small amount of vignetting can easily be removed in post)Thanks to hard stops at ND8 and ND128 the filter doesn't cause that dreaded X.Pros:- Excellent value for money- Great build quality and usability- Minimal vignetting and colour cast- Nano X glass offers clarity, scratch resistance and waterproofingCons- Case could be sturdier (a metal tin and an insert to hold the filter snug when in the case would have been better)As stated above, my only disappointment is the case. It will keep the filter safe, however the filter does just sit inside on top of a piece of foam allowing it to slide around.All in all another quality product from K&F! I'm certain it won't be my last purchase from this brand!

After extensive testing, I can absolutely recommend the filter. It shows no annoying vignetting, the glass is very well made.
The packaging of the filter is also nice, the enclosed box saves space and is great for transport.
Due to the variability, it can be used in almost any lighting condition.

Filter up to my expectations, consistent with the description, no cross!!
This is very good value for money! I can only recommend.