Filter used on a sigma 24-35. Very practical in variable to make long poses during the day.

I was looking for a filter of this type not too heavy because this kind of photo is not my primary activity. This K&F Concept ND Filter is perfect and not too expensive!

I use the filter mostly for my Galaxy Note 9. The filter is just perfect and made a huge difference on my photos. I am very amazed with the clarity of my photos. It is a good buy.

Does leave a noticeable pattern near maximum darkness. From 0% to about 80% it's clean, but above 80% light reduction it will quickly become rather unusable. At 90%, it does become very obvious.

Great ND filter to have for those sunny days. Using it in my Sigma 1.4mm lens and it helps produce some stunning shots in bright sunny days. Made of good quality materials.

Not sure what took me so long to copp an ND Filter especially a variable one

Took some photos over the weekend and seemed to do well no issues.

Well, the ND filter simply does its job. It gives me a lot more control over the 16mm f/1.4 lens from Sigma, which is an excellent piece of glass. Since it is a fast, wide angle lens, there can be challenges which are easily dealt with using an ND filter. I did read the comment from a reviewer that mentioned an dark "x mark" across his image. I had to see if I could replicate it with this. I cranked the filter way past what I would have normally set it for, and was able to see the x as well. Neat. It's easily fixed though. Just don't "crank" an ND filter further than is necessary. I have a feeling that most all of them will exhibit the same characteristic, so it's just a matter of operator procedure to see that it doesn't happen. Honestly, I had never noticed it, simply because it was a setting that was never called for, given any of the lighting conditions I was shooting in. I can go to manual settings on my camera, and get a blacked out image, if I push the settings into "deep space", but why would I? Otherwise, the filter shows good edge sharpness, and no detectable distortion, but I'm not terribly picky. It gets rid of what problems I might have had with a high speed, wide angle lens, which is what I bought it for. Nice ND filter, and I'd buy it again.

Good product