The vignette with this filter is a serious issue and I wish that I had read about this issue before purchasing it. You can see the issue in the attached photo.
29/07/2020
First K&F filter and actually surprised a bit by it's quality for such a affordable price
02/07/2020
I shoot with the Fujifillm X-T3 which arguably is the best video camera under $3000. However it lacked the variable ND filters that you would find built in to more professional video camera. I needed some more motion blur and lower my exposure when shooting video and this does it amazingly without any noticeable loss of details and colors. For the price this is a very valuable tool in my arsenal. The build quality is really nice with an all metal construction. The ring itself is smooth and allows for a nice variable exposure change. I really dig this ND filter and I think anyone should take a look at this since the image it produces are pretty clean.
08/04/2020
Great picture quality. Has a stop in the ring to keep you from getting in the orientation that causes the cross pattern abberation.
19/01/2020
A very good filter. It’s very smooth and has a stopping point. I used this on my sigma art lens for a shoot. No vignetting!
02/12/2019
I was pleasantly surprised by this variable filter. I use this with Moment lenses to film on my iPhone. I previously tried out another brand but the distortions made the video unusable. I was skeptical about the K&F Concept filters because the price was so low. But the reviews were good so I gave it a try. The packaging and case was nice and the filter itself felt like a well-engineered product. Everything was higher quality than what I was expecting. Then I tried the filters and my video came out great. The only issue I really notice it when you crank up to the highest setting. But that seems to be the case for just about every variable filter I have seen. If you stay just under that, it is perfect. I even bought a few additional filters for my regular camera. For the price point, you get a really good product. I would definitely recommend this.
19/11/2019
Pretty damn good. I’ve shot with it several times over the past week or so. It’s awesome. Great quality filter.
19/09/2019
I just received my ND filter today. Excited to get going with it. Tried a few test shots and it seems to work as advertised. However, I am dissatisfied with the company since I am unable to receive the extended warranty. I went to the site and entered the order number from Amazon into the required bucket. Error message came up and my order number was rejected. Therefore, no extended warranty. Very disappointing and frustrating that the Amazon order number is unacceptable to the company!
28/08/2019